Interplate seismicity at the CRISP drilling site: The 2002 Mw 6.4 Osa Earthquake at the southeastern end of the Middle America Trench
Interplate seismicity at the CRISP drilling site: The 2002 Mw 6.4 Osa Earthquake at the southeastern end of the Middle America Trench
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CRISP 钻井现场的板间地震活动：2002 年中美洲海沟东南端的 Mw 6 4 Osa 地震
DOI：
10.1002/2014gc005359
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发表时间：
2002
期刊：
影响因子：
3.7
通讯作者：
R. von Huene
中科院分区：
文献类型：
--
作者：
Arroyo;I. Grevemeyer;C. R. Ranero;R. von Huene
我们调查了海底地形变化和传入板块的年龄与板间地震活动之间的潜在关系。从哥斯达黎加的奥萨半岛向向西，进入的科科斯板块的性质发生了重大变化，表现为海底深度和热结构的突然横向变化。在这里，一个6.4级逆冲地震之后，在2002年6月的三个余震群。最初的重新定位表明，主震发生在哥斯达黎加中部附近的中美洲海沟沿着大多数大地震的海沟附近。地震序列发生时，一个临时网络的OBH和陆地站约80公里的西北部部署。通过增加当地常设台站的读数，我们得到了一个大俯冲带地震的罕见P波覆盖范围。我们使用非线性概率方法在1-D和3-DP波速模型中重新定位该目录。主震发生在距海沟约25 km处，可能沿着5-10 km深度的板块界面。通过对地震资料的分析，进一步确定了主震的破裂过程。最佳深度估计表明，大部分地震能量是在大陆坡以下较浅的深度辐射的，这支持了Osa地震在1.66公里深度成核的说法。位置和深度与成核区域附近激发的叠前深度偏移反射线中成像的板块边界一致。余震传播下倾到1999年Mw 6.9序列的区域，并部分重叠it. The结果表明，下冲的年轻和浮力科科斯岭创造了板间地震成因的条件比其他地方沿着中央哥斯达黎加边缘更浅，更接近海沟轴。
We investigate potential relations between variations in seafloor relief and age of the incoming plate and interplate seismicity. Westward from Osa Peninsula in Costa Rica, a major change in the character of the incoming Cocos Plate is displayed by abrupt lateral variations in seafloor depth and thermal structure. Here a Mw 6.4 thrust earthquake was followed by three aftershock clusters in June 2002. Initial relocations indicate that the main shock occurred fairly trenchward of most large earthquakes along the Middle America Trench off central Costa Rica. The earthquake sequence occurred while a temporary network of OBH and land stations ∼80 km to the northwest were deployed. By adding readings from permanent local stations, we obtain uncommonPwave coverage of a large subduction zone earthquake. We relocate this catalog using a nonlinear probabilistic approach within both, a 1‐D and a 3‐DPwave velocity models. The main shock occurred ∼25 km from the trench and probably along the plate interface at 5–10 km depth. We analyze teleseismic data to further constrain the rupture process of the main shock. The best depth estimates indicate that most of the seismic energy was radiated at shallow depth below the continental slope, supporting the nucleation of the Osa earthquake at ∼6 km depth. The location and depth coincide with the plate boundary imaged in prestack depth‐migrated reflection lines shot near the nucleation area. Aftershocks propagated downdip to the area of a 1999 Mw 6.9 sequence and partially overlapped it. The results indicate that underthrusting of the young and buoyant Cocos Ridge has created conditions for interplate seismogenesis shallower and closer to the trench axis than elsewhere along the central Costa Rica margin.
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DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
Mario Fernández Arce;D. Doser
通讯作者：
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影响因子：
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DOI：
--
发表时间：
1987
期刊：
影响因子：
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作者：
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通讯作者：
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影响因子：
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DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
J. Moore;R. Christie;Meneghini Francesca
通讯作者：
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