Realtime Earthquake Mechanism Monitoring System based on Long-period Seismic Wavefield

在本研究项目中，我们打算对长周期地震波场进行监测，以推断出与长周期波场一致的地震活动场。在之前的研究项目中，我们已经注意到，有可能每秒都能实时完成这一过程。挑战在于如何实现连续运行的系统。我们开发并实现了这样一个基于长周期地震波前连续监测的实时矩张量反演系统。该系统每1秒确定一个能最好地解释观测到的长周期地震波场的矩张量解。在目前的实施下，一台PC可以监控250公里x250公里(100公里深)的区域。东京大学地震研究所现在使用该系统监测本州岛东海岸5个地区的地震活动。结果发布在GRID MT主页(http://wwweic.eri.u-tokyo.ac.jp/GRiD_MT/).

In this research project, we intended to monitor the long-period seismic wavefield to infer the earthquake activity field which is consistent with the long-period wavefield. In the previous research project, we had noticed that it may be possible to do that every second in realtime. The challenge was how to implement the system which operates continuously.We have developed and implemented such a realtime moment tensor inversion system based on continuous monitoring of the long-period seismic wavefiled. The system determines a moment tensor solution which explains the observed long-period seismic wavefield best every one second. With the current implementation, a 250kmx250km (100km in depth) area can be monitored with a single PC. The earthquake Research Institute of the University of Tokyo now monitors the seismicity of 5 regions along the east coast of Honshu island using this system. Results are posted at GRiD MT home page (http://wwweic.eri.u-tokyo.ac.jp/GRiD_MT/).