Monitoring of microearthquakes and foreshocks through applying the Matched Filter technique to continuous seismograms of Hi-net

2014 Fiscal Year Final Research Report

• Project/Area Number: 25887052
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Solid earth and planetary physics
• Research Institution: National Research Institute for Earth Science and Disaster Prevention
• Principal Investigator: SAWAZAKI Kaoru 独立行政法人防災科学技術研究所, 観測・予測研究領域 地震・火山防災研究ユニット, 特別研究員 (30707170)
• Project Period (FY): 2013-08-30 – 2015-03-31
• Keywords: Matched Filter法 / Hi-net / 前震

Outline of Final Research Achievements

Applying the Matched Filter technique to Hi-net continuous seismogram record, I detected microearthquakes (magnitude smaller than 1) which had not been detected through the conventional earthquake relocation method. About 3.8 million events were detected during the time period from October 2000 to June 2014. I examined a relationship between the activity of the microearthquakes and the occurrence of several large inland earthquakes. I concluded that the activation of microearthquakes is not necessarily followed by a large earthquake, which implies that prediction of large earthquake from its micro-foreshock activity is still difficult.

Free Research Field

地震学