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

这笔赠款将通过SGER计划为急需的支持提供资金，以支付1991年4月22日哥斯达黎加大地震(M=7.5)现场测量的关键成本。在主震之前，首席调查员在哥斯达黎加西海岸安装了一个便携式地震仪网络，预计那里将发生地震。这些便携式仪器扩大了哥斯达黎加和加州大学圣克鲁斯分校于1984年安装的永久地震仪网。4月22日的地震发生在东海岸的台网外，但获得了有价值的强震数据。将在余震区周围部署更多的便携式空间站。这项研究是国家减少地震灾害计划的一部分。

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.