Investigations of the April 22, 1991 Magnitude 7.5 Costa Rica Earthquake

这笔赠款将通过SGER项目提供急需的支持，以支付1991年4月22日哥斯达黎加大地震（M=7.5）现场测量的关键费用。在主震发生之前，首席研究员在哥斯达黎加西海岸中心安装了一个便携式地震仪网络，以预测那里会发生地震。这些便携式仪器增强了1984年安装的哥斯达黎加/加州大学圣克鲁斯分校联合永久地震仪网。4月22日的事件发生在东海岸的网外，但获得了宝贵的强震数据。将在余震地区周围部署更多的便携式监测站。这项研究是国家减少地震危害计划的一个组成部分。

This grant will fund urgently needed support through the SGER program to cover the critical costs for field measurements of the large (M=7.5) Costa Rica earthquake of April 22, 1991. Prior to the main shock, the principal investigator installed a portable network of seismometers centered on the western coast of Costa Rica in anticipation of an earthquake there. These portable instruments augmented the joint Costa Rica/UC Santa Cruz permanent seismometer net installed in 1984. The April 22 event occurred just outside of the net on the eastern coast but valuable strong motion data were obtained. Additional portable stations will be deployed to surround the aftershock region. This research is a component of the National Earthquake Hazard Reduction Program.