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Coseismic and potential early afterslip distribution of the 2009 M-w 6.3 L'Aquila, Italy earthquake
https://nied-repo.bosai.go.jp/records/4685
https://nied-repo.bosai.go.jp/records/4685cdb97db5-2ba6-4bd6-a87d-a61fe51ebdfb
| Item type | researchmap(1) | |||||||||||||||
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| 公開日 | 2023-03-30 | |||||||||||||||
| タイトル | ||||||||||||||||
| 言語 | en | |||||||||||||||
| タイトル | Coseismic and potential early afterslip distribution of the 2009 M-w 6.3 L'Aquila, Italy earthquake | |||||||||||||||
| 言語 | ||||||||||||||||
| 言語 | eng | |||||||||||||||
| 著者 |
Tomoko E. Yano
× Tomoko E. Yano
× Guangfu Shao
× Qiming Liu
× Chen Ji
× Ralph J. Archuleta
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| 抄録 | ||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||
| 内容記述 | In view of significant discrepancy between the slip models of the 2009 April 6 L'Aquila, (Italy) earthquake based on seismic waveforms or geodetic data, a new inversion strategy is proposed to constrain the coseismic rupture model and early post-seismic afterslip model of this earthquake. Both models were jointly inverted simultaneously from the near-source strong ground motion recordings, teleseismic P waves, long-period Rayleigh waves, GPS displacement vectors and InSAR line-of-sight displacement image. The deformations are mapped onto the fault with strike 140A degrees and dip 50A degrees to the southwest. The coseismic period here represents the first 10 s after the rupture initiation, when over 99 per cent of our total seismic moment (3.07 x 10(18) Nm) is already released in our preferred coseismic model. Most coseismic slip occurs in a small rupture area of approximately 16 km along strike and in a depth range of 3-10 km. The average slip is 0.45 m; peak slip reaches about 0.90 m. Our result reveals that L'Aquila rupture has a lag of 0.6 s before it first propagates updip to break an asperity equivalent to an M-w 5.7. And then the rupture propagates along strike to break a large patch located about 8.0 km along strike and 4.0 km updip from the hypocentre. The weighted average of the rise time and slip velocity are 0.71 s and 0.77 m s(-1), respectively. Our estimate of radiated seismic energy is 1.67 x 10(13) J, yielding an energy to seismic moment ratio of 0.55 x 10(-5), considerably smaller than the global average for shallow earthquakes. The early post-seismic period here represents the time window from 10 s to about first day. During this period, our preferred post-seismic model has an accumulated seismic moment of 6.0 x 10(17) Nm, equivalent to an M-w of 5.8. The afterslip distribution features two separated high slip fault patches, locating either near the hypocentre or the region with peak coseismic slip. Their locations only partially overlap with the fault patches with significant afterslip after the first day. In particular, the slip distribution of the shallower patch is quantitatively consistent with the Amoruso and Crescentini' diffusive afterslip model. Therefore, the coseismic rupture of the 2009 L'Aquila earthquake was following by a slow-slip event with significant moment release in first hour. | |||||||||||||||
| 言語 | en | |||||||||||||||
| 書誌情報 |
en : GEOPHYSICAL JOURNAL INTERNATIONAL 巻 199, 号 1, p. 23-40, 発行日 2014-10 |
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| 出版者 | ||||||||||||||||
| 言語 | en | |||||||||||||||
| 出版者 | OXFORD UNIV PRESS | |||||||||||||||
| ISSN | ||||||||||||||||
| 収録物識別子タイプ | EISSN | |||||||||||||||
| 収録物識別子 | 1365-246X | |||||||||||||||
| DOI | ||||||||||||||||
| 関連識別子 | 10.1093/gji/ggu241 | |||||||||||||||
