Earthquake Ground Motions by Blind Faults in the Upper Crust:Categorization of Earthquakes Based on Geological Survey and Examination of the Upper Level from Strong Motion Records
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概要
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Upper level of seismic ground motions caused by blind faults in the upper crust is examined on the basis of near-source strong motion records observed on rock sites in Japan and California. In this paper, the blind fault is defined as the fault that cannot be identified in advance by the detailed geological surveys such as the lineament analysis from aerial photographs, field investigation, and so on. We investigate 41 earthquakes that occurred in the upper crust with a moment magnitude (Mw) from 5.6 to 7.5, and use 30 strong motion records observed at 15 stations on rock sites from 11 earthquakes to determine the upper strong motion level for blind faults. The estimated upper level is as follows: the peak ground acceleration is 450 cm/s/s, the flat level of the acceleration response spectra is 1200 cm/s/s, and the flat level of the velocity response spectra is 100 cm/s on rock sites with share wave velocity of about 700 m/s.
- 一般社団法人 日本地震工学会の論文
一般社団法人 日本地震工学会 | 論文
- Scope of this issue
- Study on the Priority of Measuring against Scenario Earthquakes Based on Seismic Risk Estimation
- Investigation on Actual Disaster Responses in Local Governments in terms of Information Sharing
- Empirical Correction of Ground Motion Prediction Equations of Response Spectra at Rock Sites for Near-Field Earthquakes Considering Amplification Effect within Deep Subsurface Structure
- A Study for Estimating Suspension Time of Railway Lines Due to Earthquake