3D Local Earthquake Tomography of the Ecuadorian Margin in the Source Area of the 2016 Mw 7.8 Pedernales Earthquake
3D Local Earthquake Tomography of the Ecuadorian Margin in the Source Area of the 2016 Mw 7.8 Pedernales Earthquake
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2016 年 Mw 7.8 佩德纳莱斯地震震源区厄瓜多尔边缘的 3D 局部地震层析成像
DOI：
10.1029/2020jb020701
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Hidalgo, Silvana
中科院分区：
文献类型：
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作者：
León‐Ríos, Sergio;Bie, Lidong;Agurto‐Detzel, Hans;Rietbrock, Andreas;Galve, Audrey;Alvarado, Alexandra;Beck, Susan;Charvis, Philippe;Font, Yvonne;Hidalgo, Silvana
基于手动分析的波形记录的永久厄瓜多尔网络和我们的大型余震部署安装后，足目地震，我们推导出三维Vp和Vp/Vs结构和地震位置的中部沿海厄瓜多尔使用当地地震层析成像。图像突出了俯冲和覆盖板块的特征，深度达35公里。Vp异常（4.5-7.5 km/s）反映了洋壳（OC）的粗糙度。Vp/Vs的变化范围为1.75 ~ 1.94，平均值为1.82，与海洋性的沉积物一致。我们确定了一个低Vp（约5.5 km/s）的区域，沿沿着延伸，在海洋前弧。在北部，我们将这一低Vp和Vp/Vs（<1.80）区域与可能是卡内基海岭一部分的俯冲海山联系起来。在南部，低Vp区域与高Vp/Vs（>1.85）相关，我们将其解释为深度断裂，可能是由CR俯冲引起的水化OC。这些特征在控制边缘的地震行为中起着重要作用。虽然俯冲海山可能有助于北方段中等规模逆冲断层地震的成核，但CR似乎是控制该地区地震活动的主要特征，它促进了近海蠕动和缓慢滑动事件，这可能与北方段大型逆冲断层地震的上倾极限有关，而在仪器监测期间南部地区没有此类地震。
Based on manually analyzed waveforms recorded by the permanent Ecuadorian network and our large aftershock deployment installed after the Pedernales earthquake, we derive three‐dimensional Vp and Vp/Vs structures and earthquake locations for central coastal Ecuador using local earthquake tomography. Images highlight the features in the subducting and overriding plates down to 35 km depth. Vp anomalies (∼4.5–7.5 km/s) show the roughness of the incoming oceanic crust (OC). Vp/Vs varies from ∼1.75 to ∼1.94, averaging a value of 1.82 consistent with terranes of oceanic nature. We identify a low Vp (∼5.5 km/s) region extending along strike, in the marine forearc. To the North, we relate this low Vp and Vp/Vs (<1.80) region to a subducted seamount that might be part of the Carnegie Ridge (CR). To the South, the low Vp region is associated with high Vp/Vs (>1.85) which we interpret as deeply fractured, probably hydrated OC caused by the CR being subducted. These features play an important role in controlling the seismic behavior of the margin. While subducted seamounts might contribute to the nucleation of intermediate megathrust earthquakes in the northern segment, the CR seems to be the main feature controlling the seismicity in the region by promoting creeping and slow slip events offshore that can be linked to the updip limit of large megathrust earthquakes in the northern segment and the absence of them in the southern region over the instrumental period.
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厄瓜多尔中部俯冲带浅层慢滑事件引发强烈界面地震活动
DOI：
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发表时间：
2013
期刊：
影响因子：
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作者：
M. Vallée;J. Nocquet;J. Battaglia;Y. Font;M. Segovia;M. Régnier;P. Mothes;P. Jarrín;D. Cisneros;Sandro Vaca;H. Yepes;X. Martin;N. Béthoux;M. Chlieh
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影响因子：
5.3
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Hoskins, Mariah C.;Meltzer, Anne;Font, Yvonne;Agurto-Detzel, Hans;Vaca, Sandro;Rolandone, Frederique;Nocquet, Jean-Mathieu;Soto-Cordero, Lillian;Stachnik, Joshua C.;Beck, Susan
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R. Collings;D. Lange;A. Rietbrock;F. Tilmann;D. Natawidjaja;B. Suwargadi;Matthew Miller;J. Saul
影响因子：
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