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A Seismic Intensity Survey of the 16 April 2016 Mw 7.8 Pedernales, Ecuador, Earthquake: A Comparison with Strong‐Motion Data and Teleseismic Backprojection
Seismological Research Letters ( IF 3.3 ) Pub Date : 2021-07-01 , DOI: 10.1785/0220200290
Ellen M. Smith 1 , Walter D. Mooney 1
Affiliation  

We conducted a seismic intensity survey in Ecuador, following the 16 April 2016 Mw 7.8 Pedernales earthquake, to document the level of damage caused by the earthquake. Our modified Mercalli intensities (MMIs) reach a maximum value of VIII along the coast, where single, two, and multistory masonry and concrete designed buildings partially or completely collapsed. The contours of our MMI maps are similar in shape to the contour maps of peak ground acceleration (PGA) and peak ground velocity (PGV). A comparison of our seismic intensities with the recorded PGA and PGV values reveals that our MMI values are lower than predicted by ground‐motion intensity conversion equations that are based on shallow crustal earthquakes. The image of the earthquake rupture obtained using teleseismic backprojection at 0.5–2.0 Hz is coincident with the region of maximum MMI, PGA, and PGV values, Thus, rapid calculation of backprojection may be a useful tool for guiding the deployment of emergency response teams following large earthquakes. The most severe damage observed was, primarily, due to a combination of poorly constructed buildings and site conditions.

中文翻译:

2016 年 4 月 16 日 Mw 7.8 Pedernales,厄瓜多尔地震的地震强度调查:与强震数据和远震反向投影的比较

在 2016 年 4 月 16 日 Mw 7.8 Pedernales 地震之后,我们在厄瓜多尔进行了地震烈度调查,以记录地震造成的破坏程度。我们修改后的 Mercalli 强度 (MMI) 沿海岸达到最大值 VIII,其中单层、两层和多层砖石和混凝土设计的建筑物部分或完全倒塌。我们的 MMI 地图的等高线在形状上类似于峰值地面加速度 (PGA) 和峰值地面速度 (PGV) 的等高线图。将我们的地震强度与记录的 PGA 和 PGV 值进行比较,表明我们的 MMI 值低于基于浅地壳地震的地震动强度转换方程所预测的值。使用远震反投影在 0.5-2 处获得的地震破裂图像。0 Hz 与 MMI、PGA 和 PGV 值最大的区域重合,因此,反向投影的快速计算可能是指导大地震后应急响应小组部署的有用工具。所观察到的最严重的损坏主要是由于建筑质量差和场地条件共同造成的。
更新日期:2021-06-28
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