Research Interests
研究内容
- Mathematical modeling of earthquake fault mechanics
- 地震発生物理学の数理モデリング
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Dynamic rupture of earthquake faults lying along and intersecting with a material interface
Detail
Seismic waves are reflected and refracted at interfaces of dissimilar rocks, such as strata and plate boundaries, just as light is reflected at the the water surface. We analyze theoretically, using differential and integral equations and computer simulations, what is different and how earthquakes become more complicated when the fault rupture expands around the interfaces compared to the case without the interface. -
媒質境界近傍の断層における地震時の動的破壊伝播
詳細
地層やプレート境界など, 異なる岩石が接する境界では, 光が空気中から水面へ入射するときと同じように, 地震波も反射や屈折を生じます. その周辺で地震が起き, 断層の破壊が拡大するとき, 境界が無い場合と比べて何が異なるのか, 地震はどのように複雑化するのか, 微分・積分方程式やコンピュータシミュレーションを用いて理論的に解析します.
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Mechanisms of rupture velocity/direction
Detail
The rupture propagation within rocks during an earthquake accelerates instantly and spreads across the fault plane at a speed of more than 2 km per second. However, unlike woods or glass, which break to the edge of the material in most cases, the fault rupture propagation always slows down and finally stops. On the other hand, the rupture is not always in all directions. The speed and direction of rupture varies by events, and it is still veiled what mechanism is behind it. -
破壊伝播の速度や方向が決まるメカニズム
詳細
地震時の岩石の破壊は, 一瞬で加速して, 秒速 2 km 以上のスピードで断層面を拡がります. しかし割り箸やガラスがほとんどの場合に材料の端まで割れるのとは違い, 断層の破壊拡大は必ず減速し, どこかで停止します. 一方で, 破壊が拡がる方向は四方八方とは限りません. このスピードや方向は地震のたびに様々で, どのようなメカニズムに従うのか, 完全には分かっていません.
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Slip/stress heterogeneity, energy release, and foreshock-mainshock-aftershock sequences
Detail
After an earthquake, a slip of several meters may appear on the ground surface, and this slip is the true nature of the earthquake. Even when the slip is not visible on the ground surface, it occurs on the fault plane in deep underground . The slip amount is heterogeneous and shows a complex distribution. We are interested in how this distribution relates to the energy release of earthquakes and complex seismic activities with foreshocks and aftershocks. -
滑りや応力の不均質とエネルギー解放, 前震-本震-余震系列の関係
詳細
地震後, 地表に数 m のずれが現われることがあり, このずれが地震の正体です. あるいは地表に見られなくても, ずれは地下深くで生じており, 断層面に沿って岩石が滑った痕跡です. この滑りの量は一回の地震においても場所ごとに異なり, 複雑な分布を示します. この分布が, 地震のエネルギー解放や, 前震・余震を伴なう複雑な地震活動とどう関係するのかが興味の対象です.
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Source time functions based on a stochastic differential equation
Detail
Fault slip during an earthquake accelerates from a resting state to a few m/s and finally stops again. The process of this acceleration, analyzed from the seismic waves, yields a complicated and various time series. Despite the complexity, their statistical and empirical laws have been obtained, and we have found that a stochastic differential equation, also used in economics and other fields, effectively represents the process mathematically. -
確率微分方程式を用いた震源時間関数のモデル化
詳細
地震時の断層滑りは, 停止状態から数 m/s 程度まで加速した後, 最終的には再び停止します. その経過を地震波から求めると, 非常に複雑で, かつ地震ごとに多様な, 個性豊かな関数が得られます. しかし複雑ながらも統計的な経験則は得られており, 数学的にそれを表現するには, 経済学などでも用いられる確率微分方程式という道具が有効であることが分かってきました.
- Methodology for seismic data analysis
- 地震波形データ解析の手法改良
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Objective threshold for similar earthquake detection based on the extreme value theory and an information criterion
Detail
Small earthquakes are numerous and provide a wealth of information. To find tiny tremors caused by them, we have to search for waveforms similar to known seismic waveforms from a large amount of seismograph data. This requires much data processing and a criterion for determining how similar the waveforms are to those of a known earthquake. We are developing new algorithms and software to speed up the processing and studying theories based on statistics and information science for the determination. -
極値統計と情報量規準に基づく, 地震波形相関法における客観的な閾値決定
詳細
小地震は数が多く, そこから得られる情報も豊富です. 小地震による微弱な揺れを見つけるため, 膨大な地震計のデータから, 既知の地震波形と似た波形を探すことがあります. そのためには大量のデータ処理と, どの程度似ていれば地震と判定するかの根拠が求められます. 処理を高速化するため新たなアルゴリズムとソフトウェアの開発を, 判定のため統計学・情報科学に基づく理論の研究を進めます.
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Seismic event-pair detection by Deep hashing
Detail
Seismic waveforms differ in various ways depending on the position and orientation of the fault and its relationship with the observation points. If we can classify similar seismic waveforms by assigning short labels, we can immediately compare them with similar earthquakes in the past when new waveforms were obtained. These labels are called hash values, and we have shown that deep learning can contribute to finding a function that efficiently assigns hash values to various waveforms. -
深層学習ハッシュ関数による相似地震検知
詳細
断層の位置や向き, および観測点との位置関係によって, 地震波形は様々に異なります. その中で類似の地震波形に短いラベルを付けて分類することができれば, 新たな波形が得られたとき, 過去のよく似た地震と直ちに比較することができます. このラベルをハッシュ値と呼び, 多様な波形に効率的にハッシュ値を割り当てる関数を探すため, 深層学習を利用できることを示しました.
- Laboratory seismology
- 実験地震学
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Dynamic opening/shear rupture in a photoelastic medium
Detail
Strong stresses act on rocks during an earthquake, causing widespread dynamic rupture. Since it is difficult to observe the distribution of stresses inside a rock during the rupture, we use materials that allow us to “watch” the stresses. The strength of the stresses inside the rock can be visualized by transmitting light through acrylic or agar and passing via a polarizing filter. Using this technique, we will observe the distribution of stresses when a material ruptures and discuss fault behavior. -
光弾性媒質中の動的開口/せん断破壊
詳細
地震時には岩石に大きな力が作用し, 破壊が拡がります. その直前や最中に岩石内部の力の分布を計測することは難しいので, 力を「視る」ことが可能な材料を使います. アクリルや寒天などに光を透過させ, 偏光板というフィルタを通すと, 内部に作用している力の強弱が可視化されます. この技術を用いて, 材料が破壊する際の力の分布を観察し, 断層運動について考察します.
Academic Positions & Education
経歴
- Assistant professor, May. 2024 -- present
- 助教, 2024年05月 -- 現在
- Department of Global Environment and Disaster Prevention Sciences, Faculty of Science and Technology, Hirosaki University, Japan
- 弘前大学大学院 理工学研究科 地球環境防災学コース
- Teaching Seismology etc.
- 担当科目: 地震学I, 地球環境学演習I etc.
- Assistant professor, Apr. 2015 -- Apr. 2024
- 助教, 2015年04月 -- 2024年04月
- Department of Physical Science, College of Science and Engineering, Ritsumeikan University, Japan
- 立命館大学 理工学部 物理科学科
- Teaching Earth Science/Laboratory Works in Earth Science
- 担当科目: (教養)地球科学, 宇宙地球科学1, 地学実験, 物理学実験実習 etc.
- Postdoctoral fellow, Oct. 2013 -- Mar. 2015
- ポスト・ドクター研究員, 2013年10月 -- 2015年03月
- Mega Quake Risk Management Project / Faculty of Engineering, Information and Systems, Tsukuba University, Japan
- 筑波大学「巨大地震による複合災害の統合的リスクマネジメント」プロジェクト
- PhD course, Apr. 2009 -- Sep. 2013
- 博士後期課程 2009年04月 -- 2013年09月
- Earthquake Research Institute / Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, Japan
- 東京大学大学院 理学系研究科 地球惑星科学専攻 / 東京大学地震研究所
- supervised by Teruo Yamashita and Nobuki Kame
- 指導教員: 山下輝夫, 亀伸樹
- Internship, Jul. 2011 -- Aug. 2011
- 海外インターン, 2011年07月 -- 2011年08月
- School of Engineering and Applied Science, Harvard University, U.S.
- research assistant of James R. Rice
- Master's course, Apr. 2007 -- Mar. 2009
- 博士前期課程, 2007年04月 -- 2009年03月
- Earthquake Research Institute / Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, Japan
- 東京大学大学院 理学系研究科 地球惑星科学専攻 / 東京大学地震研究所
- supervised by Teruo Yamashita
- 指導教員: 山下輝夫
- Undergraduate course, Apr. 2003 -- Mar. 2007
- 学士課程, 2003年04月 -- 2007年03月
- Department of Mathematics, Faculty of Science Division I, Tokyo University of Science, Japan
- 東京理科大学 理学部I部 数学科
- supervised by Keiichi Kato
- 指導教員: 加藤圭一
Publications
出版物
Submitted manuscripts
- Hirano, S., & Naoi, M. (under review)
- DiallelX: a modern fortran code for calculating network cross-correlation
- Naoi, M., Hirano, S., & Chen, Y. (under review)
- High-resolution monitoring of hydraulically induced acoustic emission activities using neural phase picking and matched filter analysis
Peer-reviewed journal papers
- Naoi, M., & Hirano, S.. (2024)
- Efficient similar waveform search using short binary codes obtained through a deep hashing technique
- Geophys. J. Int., 273(1):607--621, doi:10.1093/gji/ggae061
- Yagi, Y., Okuwaki, R., Hirano, S., Enescu, B., Chikamori, M., & Yamaguchi, R. (2024)
- Barrier-induced rupture front disturbances during the 2023 Morocco earthquake
- Seismol. Res. Lett., 95(3):1591--1598, doi:10.1785/0220230357
- Ohara, K., Yagi, Y., Yamashita, S., Okuwaki, R., Hirano, S., & Fukahata, Y. (2023)
- Complex evolution of the 2016 Kaikoura earthquake revealed by teleseismic body waves
- Prog. Earth Planet. Sci., 10:35, doi:10.1186/s40645-023-00565-z
- Hirano, S., Kawakata, H. & Doi, I. (2022)
- A matched-filter technique with an objective threshold
- Sci. Rep., 12:22090, doi:10.1038/s41598-022-25839-2
- 大嵜雅人, 吉光奈奈, 平野史朗, 福山英一 (EN: Osaki, M., Yoshimitsu, N., Hirano, S., & Fukuyama, E.) (2022)
- 注水による誘発地震発生場を模擬した寒天ゲルを用いた光弾性実験手法 (EN: Photoelastic experimental approach using agar gel to simulate a stress field of fluid injection induced earthquakes)
- 地震 第2輯 (Zisin: Journal of Seismological Society of Japan), 75:83--91, doi:10.4294/zisin.2021-17 (Japanese text with English abstract.)
- Hirano, S. (2022)
- Source time functions of earthquakes based on a stochastic differential equation
- Sci. Rep., 12:3936, doi:10.1038/s41598-022-07873-2
- Numerical results in an ascii format: OSF: Open Science Framework, doi:10.17605/OSF.IO/VUXJ6
- Nakayama, M., Kawakata, H., Hirano, S., & Doi, I. (2021)
- Development of a laboratory monitoring system for elastic waves transmitted through sand under dry and saturated conditions
- Earth Planet Space, 73(25), doi:10.1186/s40623-020-01346-4
- Hirano, S., & Itou, H. (2020)
- Parameter interdependence of dynamic self-similar crack with distance-weakening friction
- Geophys. J. Int., 223(3):1584--1596, doi:10.1093/gji/ggaa392
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Erratum
eq. (7) must be $L(x) = \displaystyle \log\left|\frac{1-x}{1+x}\right|$ (absolute value symbol was missing)
$\Delta \sigma_b$ in eqs.(C1)(C5)(C6)(C7) and next line to eq.(C9) must be $\sigma_b$.
- Okuwaki, R., Hirano, S., Yagi, Y., & Shimizu, K. (2020)
- Inchworm-like source evolution through a geometrically complex fault fueled persistent supershear rupture during the 2018 Palu Indonesia earthquake
- Earth Planet. Sci. Lett., 547(2020):116449, doi:10.1016/j.epsl.2020.116449
- EarthArXiv Preprints, doi:10.31223/osf.io/j4cas
- OSF: Open Science Framework, doi:10.17605/OSF.IO/8AZ3G
- Hirano, S. (2019)
- Modeling of unilateral rupture along very-long reverse faults
- J. Geophys. Res., 124(1):1057--1071, doi:10.1029/2018JB016511.
- Okuwaki, R., Kasahara, A., Yagi, Y., Hirano, S. & Fukahata, Y. (2019)
- Backprojection to image slip
- Geophys. J. Int., 216(3):1529--1537, doi:10.1093/gji/ggy505.
- Tamaribuchi, K., Yagi, Y., Enescu, B. & Hirano, S. (2018)
- Characteristics of foreshock and aftershock activity inferred from the JMA earthquake catalog improved by automatic processing
- Earth Planet Space, 70:90, doi:10.1186/s40623-018-0866-9.
- Hirano, S. & Yagi, Y. (2017)
- Dependence of seismic and radiated energy on shorter wavelength components
- Geophys. J. Int., 209(3):1585--1592, doi:10.1093/gji/ggx108.
- Hirano, S. & Yamashita, T. (2016)
- Modeling of interfacial dynamic slip pulses with slip-weakening friction
- Bull. Seism. Soc. Am. 106(4):1628--1636, doi: 10.1785/0120150208.
Erratum
$\displaystyle \frac{1}{1+S}$ in eqs. (19)(20)(22) must be $\displaystyle - \frac{1}{1+S}$ (minus sign was missing)
- Self archive of a pre-copyedit version
- Hirano, S. & Yamashita, T. (2015)
- Dynamic anti-plane rupture propagation crossing a material interface: modelling with BIEM
- Geophys. J. Int. 200(2):1220--1233, doi:10.1093/gji/ggu471.
Erratum
eq. (26) must be $\Psi_l(X) = \displaystyle \sqrt{X^2-\beta_l^{-2}} \arctan{\frac{\eta_l}{\sqrt{X^2-\beta_l^{-2}}}} - \eta_l$ (subscript $l$ of $\beta$ was missing)
- Okuwaki, R., Yagi, Y. & Hirano, S. (2014)
- Relationship between High-frequency Radiation and Asperity Ruptures, Revealed by Hybrid Back-projection with a Non-planar Fault Model
- Sci. Rep., 4:7120, doi:10.1038/srep07120.
- Yagi, Y., Okuwaki, R., Enescu, B., Hirano, S., Yamagami, Y., Endo, S. & Komoro, T. (2014)
- Rupture process of the 2014 Iquique Chile earthquake in relation with the foreshock activity
- Geophys. Res. Lett., 41(12):4201--4206, doi: 10.1002/2014GL060274.
- Hirano, S. & Yamashita, T. (2011)
- Analysis of the static stress field around faults lying along and intersecting a bimaterial interface
- Geophys. J. Int. 187(3):1460--1478, doi:10.1111/j.1365-246X.2011.05202.x.
Peer-reviewed proceeding or departmental bulletin papers
- Hirano, S. (2020)
- Friction vs. damage: dynamic self-similar crack growth revisited
- In: Itou, H. et al. (eds) Mathematical Analysis of Continuum Mechanics and Industrial Applications III. CoMFoS18. Mathematics for Industry, Springer, doi:10.1007/978-981-15-6062-0_12
- Self archive of a pre-copyedit version
- Nakayama, M., Kawakata, H., Hirano, S., Doi, I., & Takahashi, N. (2018)
- Propagation characteristics of elastic waves transmitted through sand soils under dry and saturated conditions
- Progress in Acoustic Emission XIX, Jpn. Soc. Non-Destructive Inspection, 163--167.
- Hirano, S. (2018)
- Integral representation and its applications in earthquake mechanics: a review
- In: van Meurs, P. et al. (eds) Mathematical Analysis of Continuum Mechanics and Industrial Applications II. CoMFoS 2016. Mathematics for Industry, vol 30. Springer, Singapore, doi:10.1007/978-981-10-6283-4_9.
- Self archive of a pre-copyedit version
- Endo, S., Nakao, A., Hirano, S. & Yagi, Y. (2017)
- The 2013 Sea of Okhotsk deep earthquake: A complex rupture within the Ringwoodite stability zone
- Earth Evol. Sci., 11:23--30.
- Hirano, S. (2017)
- Propagation velocity of pulse-like rupture along earthquake faults
- In: Itou, H. et al. (eds) Mathematical Analysis of Continuum Mechanics and Industrial Applications. Mathematics for Industry, vol 26. Springer, Singapore, doi:10.1007/978-981-10-2633-1_10.
- Self archive of a pre-copyedit version
Book
- Itou, H., Hirano, S., Kimura, M., Kovtunenko, V.A., & Khludnev, A.M. (Eds.) (2020)
- Mathematical Analysis of Continuum Mechanics and Industrial Applications III. CoMFoS18. Mathematics for Industry, Springer, doi:10.1007/978-981-15-6062-0
Misc.
- Hirano, S., & Okuwaki, R. (2020)
- Note on “Backprojection to image slip”
- OSF: Open Science Framework, doi:10.17605/OSF.IO/PB7HK
- 桑野修, 平野史朗, 藤田哲史, 日下部哲也, 小寺祐貴, 亀伸樹, 中谷正生, 安藤亮輔 (2011)
- 寒天(アガロースゲル)を用いた断層の動的破壊実験
- 日本地震学会ニュースレター Vol.22 No.6, 表紙
International Conferences
国際会議発表
- Hirano, S.
- Modeling of slip on a fault during an earthquake: point-source approximation
- RIMS Workshop "Some approaches on ill-posed problems -theory and practice-", Kyoto, Japan, January 11, 2024 (Oral)
- Yasumoto, R., Hirano, S., & Kawakata, H.
- Effect of bay topography on surface waves
- American Geophysical Union 2023 Fall Meeting, San Francisco, December 12, 2023 (Poster)
- Inanishi, T., Kwakata, H., & Hirano, S.
- Source parameters of AE events in uniaxial compression tests of cement mortar specimens
- American Geophysical Union 2023 Fall Meeting, San Francisco, December 12, 2023 (Poster)
- Hirano, S.
- Stochastic source time functions with double corner frequencies
- American Geophysical Union 2023 Fall Meeting, San Francisco, December 11, 2023 (Poster)
- Hirano, S.
- Statistics and variability of source time functions based on a stochastic differential equation
- American Geophysical Union 2021 Fall Meeting, New Orleans and Online, December, 2021 (Oral)
- Okuwaki, R., Yagi, Y., Shimizu, K., Fukahata, Y., Hirano, S., Hicks, S.P., Craig, T.J., Fan, W., Goes, S.D.B., & Wright, T.J.
- Accounting epistemic uncertainty in finite-fault inversion: development of a potency-density tensor approach to investigate complex earthquake rupture processes
- American Geophysical Union 2021 Fall Meeting, New Orleans and Online, December, 2021 (Oral, Invited)
- Hirano, S.
- Various inverse problems in seismology: seismic tomography, hypocenter location, earthquake source kinematics, and Earth's crustal stress.
- Control and inverse problems on waves, oscillations and flows - Mathematical analysis and computational methods -, Online, September, 2021 (Oral)
- Hirano, S.
- Theoretical properties of source time functions based on a stochastic differential equation
- Joint Scientific Assembly IAGA-IASPEI 2021, Online, August 26, 2021 (Flash talk & Poster)
- Okuwaki, R., Hirano, S., Yagi, Y., & Shimizu, K.
- Source evolution through a geometrically complex fault system controls supershear rupture during the 2018 Palu earthquake
- FRINGE 2021 (Advances in the Science and Applications of SAR Interferometry and Sentinel-1 InSAR), Online, May 31--June 04, 2021 (Oral)
- Hirano, S., & Itou, H.
- Dynamic antiplane self-similar crack with distance-weakening friction: an analytical solution for source parameter estimation
- American Geophysical Union 2020 Fall Meeting, Online, December 16, 2020 (Flash talk & Poster)
- Go to the poster page.
- Hirano, S.
- An empirical PDE for slip along earthquake faults
- The Second Russia-Japan Workshop "Mathematical analysis of fracture phenomena for elastic structures and its applications" - 20th Conference of Continuum Mechanics Focusing on Singularities (CoMFoS20), Online, December 15, 2020 (Oral)
- Hirano, S.
- A nonlinear integro-differential equation for earthquake faulting
- RIMS Workshop on Analysis of inverse problems through partial differential equations and related topics, Kyoto, Japan, January 09, 2020 (Oral)
- Hirano, S.
- An observation-based differential equation of spatio-temporal slip distribution
- American Geophysical Union 2019 Fall Meeting, San Francisco, U.S., December 13, 2019 (Poster)
- Kakutani, T., Kawakata, H., & Hirano, S.
- Seismic response change of a sand soil after strong motion, revealed by a transmission laboratory experiment
- American Geophysical Union 2019 Fall Meeting, San Francisco, U.S., December 11, 2019 (Poster)
- Nakayama, M., Kawakata, H., Hirano, S., & Doi, I.
- Propagation characteristic changes of elastic waves transmitted through a sand soil in water injection and drainage processes
- American Geophysical Union 2019 Fall Meeting, San Francisco, U.S., December 10, 2019 (Poster)
- Hirano, S.
- Dynamic growth of a self-similar anti-plane crack during earthquakes
- Russia-Japan Workshop "Mathematical analysis of fracture phenomena for elastic structures and its applications", Novosibirsk, Russia, November 12, 2019 (Oral)
- Hirano, S.
- Energy dissipation during dynamic antiplane self-similar crack growth
- CoMFoS19:Mathematical Analysis of Continuum Mechanics and Industrial Applications, Kanazawa, Japan, July 15, 2019 (Oral)
- Hirano, S.
- Analytical solution of dynamic self-similar crack growth under distance-weakening friction
- Numerical Modeling of Earthquake Motions: Waves and Ruptures, Smolenice, Slovakia, July 01--03, 2019 (Poster)
- Hirano, S., Kawakata, H., & Doi, I.
- Foreshock activity detection by a threshold-free matched-filter technique
- Japan Geoscience Union Meeting, Chiba, Japan, May 26, 2019 (Oral)
- Hirano, S.
- Aftershocks and the GR law due to a heterogeneous slip model
- American Geophysical Union 2018 Fall Meeting, Washington D.C., U.S., December 14, 2018 (Oral)
- Nakayama, M., Kawakata, H., Hirano, S., Doi, I., & Takahashi, N.
- 24-hours broadband measurements of elastic waves transmitted through sand soils under dry and saturated conditions to investigate differences in propagation characteristics
- American Geophysical Union 2018 Fall Meeting, Washington D.C., U.S., December 10, 2018 (Poster)
- Nakayama, M., Kawakata, H., Hirano, S., Doi, I., & Takahashi, N.
- Propagation characteristics of elastic waves transmitted through sand soils under dry and saturated conditions
- 24th International Acoustic Emission Symposium, Sapporo, Japan, November 07, 2018 (Oral)
- Hirano, S., Toyomoto, Y., Kawakata, H., & Doi, I.
- Application of Extreme Value Theory to a Matched-Filter Analysis
- 10th ACES International Workshop, Awaji Island, Japan, September 27, 2018 (Poster)
- Hirano, S.
- Friction vs. damage: dynamic self-similar crack growth revisited
- CoMFoS18:Mathematical Analysis of Continuum Mechanics and Industrial Applications, Kyoto, Japan, June 13, 2018 (Oral)
- Hirano, S., Toyomoto, Y., Kawakata, H. & Doi, I.
- Objective matched-filter analysis for dertecting small events
- International Symposium on Earthquake Forecast / 5th International Workshop on Earthquake Preparation Process, ~Observation, Validation, Modeling, Forecasting~, Chiba, Japan, May 25, 2018 (Poster)
- Wakamatsu, S., Kawakata, H. & Hirano, S.
- Observed seismic and infrasonic signals around the Hakone volcano -Discussion based on a finite-difference calculation-
- American Geophysical Union 2017 Fall Meeting, New Orleans, U.S., December 15, 2017 (Poster)
- Hirano, S.
- Mathematical modeling and numerical simulation of unilateral dynamic rupture propagation along very-long reverse faults
- American Geophysical Union 2017 Fall Meeting, New Orleans, U.S., December 14, 2017 (Poster)
- Nakayama, M., Kawakata, H., Hirano, S., Doi, I. & Takahashi, N.
- Improvement in transmission experiment of elastic waves through partially saturated porous sand soil
- American Geophysical Union 2017 Fall Meeting, New Orleans, U.S., December 14, 2017 (Poster)
- Yoneda, N., Kawakata, H., Hirano, S., Yoshimitsu, N. & Takahashi, N.
- Extraction of AE events to estimate their b values under a triaxial compressive condition ~Examination using continuous broadband records~
- American Geophysical Union 2017 Fall Meeting, New Orleans, U.S., December 14, 2017 (Poster)
- Hirano, S.
- Unilateral dynamic rupture propagation along earthquake faults
- CoMFoS17:Mathematical Analysis of Continuum Mechanics and Industrial Applications, OIST, Japan, September 21, 2017 (Oral)
- Hirano, S.
- Energy estimation of earthquake faulting based on a wavefield inversion
- RIMS workshop on "Singularity and asymptotic behavior of solutions for partial differential equations with conservation law", Kyoto, Japan, June 08, 2017 (Oral)
- Hirano, S.
- Integral equation for mechanics of earthquakes
- RIMS workshop on "Inverse problems for partial differential equations and related areas", Kyoto, Japan, January 26, 2017 (Oral)
- Nakayama, M., Kawakata, H., Hirano, S., Doi, I., & Takahashi, N.
- Transmission experiment of elastic waves with short wavelengths through a highly porous sand soil during water injection
- American Geophysical Union 2016 Fall Meeting, San Francisco, U.S., December 15, 2016 (Poster)
- Toyomoto, Y., Kawakata, H., Hirano, S. & Doi, I.
- Foreshock search over a long duration using a method of setting appropriate criteria
- American Geophysical Union 2016 Fall Meeting, San Francisco, U.S., December 15, 2016 (Poster)
- Tsujimura, Y., Kawakata, H., Fukuyama, E., Yamashita, F., Xu, S., Mizoguchi, K, Takizawa, S. & Hirano, S.
- Spatio-temporal foreshock activity during stick-slip experiments of large rock samples
- American Geophysical Union 2016 Fall Meeting, San Francisco, U.S., December 13, 2016 (Poster)
- Hirano, S., Yamashita, T. & Hatano, T.
- Behavior of pulse-like rupture with velocity-time-dependent friction from a granular layer model
- American Geophysical Union 2016 Fall Meeting, San Francisco, U.S., December 12, 2016 (Oral)
- Hirano, S.
- Integral representation and its applications of the mechanics of earthquakes
- CoMFoS16:Mathematical Analysis of Continuum Mechanics and Industrial Applications, Kyushu University, Japan, October 23, 2016 (Oral)
- Hirano, S. & Yamashita, T.
- Propagation velocity of pulse-like rupture with a time-weakening friction law
- American Geophysical Union 2015 Fall Meeting, San Francisco, U.S., December 18, 2015 (Poster)
- Iwata, K., Kawakata, H., Hirano, S., & Doi, I.
- Estimation of Seismic Attenuation beneath Tateyama Volcano, Central Japan by Using Peak Delay
- American Geophysical Union 2015 Fall Meeting, San Francisco, U.S., December 17, 2015 (Poster)
- Imahori, A., Kawakata, H., Hirano, S., Yoshimitsu, N., & Takahashi, N.
- Travel Times of Later Phases for Transmitting Waves through a Fracturing Westerly Granite Sample under a Triaxial Compressive Condition
- American Geophysical Union 2015 Fall Meeting, San Francisco, U.S., December 16, 2015 (Poster)
- Hirano, S.
- Propagation velocity of pulse-like rupture along earthquake fault
- CoMFoS15:Mathematical Analysis of Continuum Mechanics and Industrial Applications, Kyushu University, Japan, November 16, 2015 (Oral)
- Hirano, S. & Yagi, Y.
- Dependence of seismic energy on higher wavenumber components
- American Geophysical Union 2014 Fall Meeting, San Francisco, U.S., December 19, 2014 (Poster)
- Yagi, Y., Okuwaki, R., Enescu, B. & Hirano, S.
- Rupture process of the 2014 Iquique Chile earthquake in relation with the foreshock activity
- American Geophysical Union 2014 Fall Meeting, San Francisco, U.S., December 17, 2014 (Poster)
- Okuwaki, R., Yagi, Y. & Hirano, S.
- Relationship between High-frequency Radiation and Asperity Rupture,Revealed by Hybrid Back-projection with Non-planer Fault
- Seismological Society of America Annual Meeting, Anchorage, U.S., May 01, 2014 (Poster)
- Hirano, S. & Yamashita, T.
- BIEM Simulation for Anti-Plane Dynamic Rupture Propagation across a Bimaterial Interface
- Seismological Society of America Annual Meeting, Anchorage, U.S., April 30, 2014 (Oral)
- Hirano, S.
- An integral representation and numerical simulation of dynamic earthquake faulting occurring in a two-layered medium
- Conference on Diffusion in Heterogeneous Media and Related Topics, Tokyo, Japan, March 06, 2014 (Oral)
- Hirano, S. & Yamashita, T.
- Off Fault Stress Distribution around Dynamic Slip Pulse on a Bimaterial Interface
- The 7th ACES International Workshop, Otaru, Japan, October 04, 2010 (Poster)
- Hirano, S. & Yamashita, T.
- Theoretical analysis of static mode-II crack in two-layered medium - interfacial fault and intersecting fault
- Workshop -Earthquake Source Dynamics: Data and Data-constrained Numerical Modeling, Smolenice Castle, Slovakia, June 28, 2010 (Poster)
- Hirano, S. & Yamashita, T.
- Mathematical and numerical analysis of non-planar static mode-II crack in a two-layered medium
- American Geophysical Union 2009 Fall meeting, San Francisco, U.S., December 17, 2009 (Poster)
- Hirano, S. & Yamashita, T.
- Mathematical and numerical analyses of arbitrarily oriented static mode-II crack in a two-layered medium
- The 7th General Assembly of Asian Seismological Commission and The 2008 Fall meeting of Seismological Society of Japan, Tsukuba, Japan, November 27, 2008 (Poster)
Award & Grants
受賞・研究費採択
- Mar. 2019
- 2019年03月
- The Young Scientist Award of Seismological Society of Japan for Extension of Mathematical Seismology
- 日本地震学会若手学術奨励賞 (受賞対象研究: 数理地震学の牽引と学際的な研究展開)
- Apr. 2022 -- Mar. 2026
- 2022年04月 -- 2026年03月
- Growth and termination of dynamic rupture revealed by a stochastic fault model
- 確率的震源モデルによって解き明かされる, 地震の成長と停止
- The JSPS Grant-in-Aid for Scientific Research(C) Program No. 22K03782
- 科学研究費助成事業 基盤研究(C) 22K03782
- Principal Investigator
- 研究代表者
- Apr. 2022 -- Mar. 2026
- 2022年04月 -- 2026年03月
- Elastodynamics for strongly heterogeneous material: experiment, numerical simulation, and theory
- 実験計測・数値計算・理論の融合による強い不均質を含む媒質に対する弾性波動論の構築
- The JSPS Grant-in-Aid for Scientific Research(B) Program No. 23K22607
- 科学研究費助成事業 基盤研究(B) 23K22607
- Co-Investigator (PI: Kawakata, H., Ritsumeikan Univ.)
- 研究分担者 (代表:川方裕則 立命館大学)
- Apr. 2021 -- Mar. 2024
- 2021年04月 -- 2024年03月
- Understanding the physics of foreshocks based on dense seismic observation and seismicity model
- 稠密地震観測データ解析と地震活動モデル構築による前震の意義の理解
- The JSPS Grant-in-Aid for Scientific Research(B) Program No. 21H01191
- 科学研究費助成事業 基盤研究(B) 21H01191
- Co-Investigator (PI: Naoi, M., Hokkaido Univ.)
- 研究分担者 (代表: 直井誠 北海道大学)
- Apr. 2018 -- Mar. 2022
- 2018年04月 -- 2022年03月
- SDE modeling for diversity and heterogeneity of earthquake ruptures
- 地震の個性や不均質を記述する確率微分方程式論的断層モデル
- The JSPS Grant-in-Aid for Early-Career Scientists Program No. 18K13637
- 科学研究費助成事業 若手 18K13637
- Principal Investigator
- 研究代表者
- Apr. 2017 -- Mar. 2021
- 2017年04月 -- 2021年03月
- Mathematical modeling and analysis of discontinuous phenomena in continuum body
- 連続体における不連続現象の数理モデリングと数学解析
- The JSPS Grant-in-Aid for Scientific Research(B) Program No. 17H02857
- 科学研究費助成事業 基盤研究(B) 17H02857
- Co-Investigator (PI: Kimura, M., Kanazawa Univ.)
- 研究分担者 (代表: 木村正人 金沢大学)
Award
受賞
Grants
研究費採択
Societies & Contributions
学会・社会貢献活動
- Scientific Societies
- 所属学会
- American Geophysical Union
- Japan Geoscience Union
- 日本地球惑星科学連合
- Seismological Society of Japan
- 日本地震学会
- The Japan Society for Industrial and Applied Mathematics (secretary of a research group Mathematical Aspects of Continuum Mechanics)
- 日本応用数理学会 (連続体力学の数理 研究部会幹事)
- Journal Associate Editor
- 学術誌編集委員
- Bulletin of the Japan Society for Industrial and Applied Mathematics (Jul. 2024 -- May. 2028)
- 応用数理 (2024年06月 -- 2028年05月)
- Journal Reviewer
- 学術誌査読
- Bulletin of Seismological Society of America
- Computers and Mathematics with Applications
- Earth Planets Space
- Environmental Earth Sciences
- European Journal of Environmental and Civil Engineering
- Geophysical Journal International
- Journal of Geophysical Research: Solid Earth
- Journal of Japan Association for Earthquake Engineering
- 日本地震工学会論文集
- Tectonophysics
- Zisin: Jounrnal of the Seismological Society of Japan
- 地震 第2輯
- Grant Reviewer
- 研究費審査員
- Israel Science Foundation
- Conference Management
- 学会大会・会議等委員
- Program committee for The 10th International Congress on Industrial and Applied Mathematics. Waseda University, Tokyo, Japan, August 20--25, 2023
- Organizing committee for CoMFoS18:Mathematical Analysis of Continuum Mechanics and Industrial Applications, Kyoto, Japan, June 13--15, 2018
- Projects
- プロジェクト
- Earthquake and Volcano Hazards Observation and Research Program (Co-investigator, 2015-)
- 災害の軽減に貢献するための地震火山観測研究計画 (研究協力者, 2015-)
- Mega Quake Risk Management project at University of Tsukuba (Postdoctoral fellow, 2013--2014)
- 筑波大学「巨大地震による複合災害の統合的リスクマネジメント」プロジェクト (ポスト・ドクター研究員, 2013--2014)
- AE measurements in deep South African gold mines: Phase II - monitoring of rock mass damage by underground cavities and prediction of rockbursts (Research assistant, 2009-2011)
- 南アフリカ大深度鉱山での AE 計測第二期:地下空洞による岩盤損傷の監視と山跳ね予知 (リサーチアシスタント, 2009-2011)