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DOI | 10.1029/2018GL080042 |
Constraining the Dip of Shallow, Shallowly Dipping Thrust Events Using Long-Period Love Wave Radiation Patterns: Applications to the 25 October 2010 Mentawai, Indonesia, and 4 May 2018 Hawaii Island Earthquakes | |
Lay, Thorne1; Ye, Lingling2,3; Kanamori, Hiroo4; Satake, Kenji3 | |
2018-10-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:19页码:10342-10349 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China; Japan |
英文摘要 | Constraining precise faulting geometry for shallow, shallowly dipping thrust earthquakes is a common challenge. Plate boundary megathrust faults near the trench and decollement faults beneath volcanic islands and nappes may dip only a few degrees. Long-period point source moment tensor waveform inversions provide limited resolution of shallow fault dip angle. The possibility of splay faulting requires precise dip estimation. High sensitivity to dip is provided by long-period Love wave amplitude azimuthal radiation patterns, which undergo rapid change from four lobed to two lobed as dip decreases from 10 degrees to 0 degrees. Modeling variability in Love wave nodal amplitudes allows the dip to be determined to within a few degrees. This is demonstrated for the 25 October 2010 Mentawai (M-WW 7.8) tsunami earthquake, which ruptured the 2.0-5.0 degrees dipping megathrust beneath the shallow sedimentary wedge offshore of Indonesia, and the 4 May 2018 Hawaii Island (M-WW 6.9) thrust earthquake, which ruptured the 2.5-7.5 degrees dipping decollement under the island flank. Plain Language Summary Earthquakes that involve thrust faulting at shallow depth occur commonly, and determining the fault dip angle is important for interpreting the nature of such events. Routine seismic wave analysis procedures for determining the faulting geometry for shallow thrust events often do not provide precise resolution of dip, leaving ambiguity in the assessment of the tectonic nature of the event. Spectral analysis of long-period radiation patterns for Love waves provides good sensitivity to fault dip angle for large shallow, shallowly dipping thrust events. Analysis of long-period surface waves for two shallow thrust events, a large near-trench subduction zone tsunami earthquake and the other a large earthquake at the base of the island mass of Hawaii, demonstrates that fault dip can be resolved to within a few degrees based on the sensitivity of Love wave radiation patterns to dip angle. Improved resolution of dip angle provides better confidence in the tectonic interpretation and improves seismic moment and slip estimation. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000448656800037 |
WOS关键词 | MOBILE SOUTH FLANK ; SINGLE-FORCE MODEL ; 1975 KALAPANA ; SOURCE PARAMETERS ; KILAUEA VOLCANO ; SURFACE-WAVES ; NOVEMBER 29 ; INVERSION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29077 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA 95064 USA; 2.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangdong Prov Key Lab Geodynam & Geohazards, Guangzhou, Guangdong, Peoples R China; 3.Univ Tokyo, Earthquake Res Inst, Tokyo, Japan; 4.CALTECH, Seismol Lab, Pasadena, CA 91125 USA |
推荐引用方式 GB/T 7714 | Lay, Thorne,Ye, Lingling,Kanamori, Hiroo,et al. Constraining the Dip of Shallow, Shallowly Dipping Thrust Events Using Long-Period Love Wave Radiation Patterns: Applications to the 25 October 2010 Mentawai, Indonesia, and 4 May 2018 Hawaii Island Earthquakes[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(19):10342-10349. |
APA | Lay, Thorne,Ye, Lingling,Kanamori, Hiroo,&Satake, Kenji.(2018).Constraining the Dip of Shallow, Shallowly Dipping Thrust Events Using Long-Period Love Wave Radiation Patterns: Applications to the 25 October 2010 Mentawai, Indonesia, and 4 May 2018 Hawaii Island Earthquakes.GEOPHYSICAL RESEARCH LETTERS,45(19),10342-10349. |
MLA | Lay, Thorne,et al."Constraining the Dip of Shallow, Shallowly Dipping Thrust Events Using Long-Period Love Wave Radiation Patterns: Applications to the 25 October 2010 Mentawai, Indonesia, and 4 May 2018 Hawaii Island Earthquakes".GEOPHYSICAL RESEARCH LETTERS 45.19(2018):10342-10349. |
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