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Estimating Radiated Seismic Energy over 17 Orders of Magnitude

估算超过 17 个数量级的辐射地震能量

基本信息

批准号：
12640407
负责人：
MORI James Jiro
金额：
$ 1.47万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640407/
关键词：
Radiated Energy Apparent Stress K-Net Source Parameters K-Net Source Paramenters Radiated Energy Source Parameters

项目摘要

This research investigated the scaling of radiated seismic energy as a function of earthquake size. Radiated energy has only recently been studied and previous reliable estimates are few. However, new instrumentation, such as K-Net in Japan allows more reliable estimates. So this research provides new results about the estimates of radiated energy of earthquakes.There were 3 main studies.1. Energy estimates for shallow (0-50 km) moderate (M4-6) earthquakes in Japan. We analyzed 115 earthquakes. To make reliable estimates of energy, station corrections for several hundred K-Net sites were determined. We found that the energy is approximately proportional to the moment. However, since the magnitude range is limited, it is difficult to see any trend from just these data. These results are similar to results for shallow earthquakes in California.2. We compared of energy estimates of shallow and deep earthquakes. 32 shallow and 37 deep events from Hokkaido and Tohoku were analyzed. To make reliable energy estimates, site corrections and path attenuation were determined for this data set. When comparing energies of shallow and deep earthquakes, the shallow earthquakes show an increase of energy to moment ratio, as a function of earthquake size. While for deep earthquakes the energy to moment ratio is constant as a function of earthquake size.3. We did some detailed work on aftershocks of the 1994 Northridge, California earthquake. This works confirms that for shallow earthquakes in California, the ratio of energy to moment increases as a function of earthquake size.

这项研究调查了辐射地震能量随地震大小的变化规律。辐射能量只是最近才被研究，以前可靠的估计很少。然而，新的仪器，如日本的K-Net，允许更可靠的估计。因此，本研究为地震辐射能量的估算提供了新的结果。日本浅层(0-50公里)中等(4-6级)地震的能量估计。我们分析了115次地震。为了对能量作出可靠的估计，确定了数百个K网站点的台站改正。我们发现能量与力矩大致成正比。然而，由于震级范围有限，仅从这些数据很难看出任何趋势。这些结果与加州浅层地震的结果相似。我们比较了浅层地震和深部地震的能量估计。分析了来自北海道和东北的32个浅层地震和37个深部地震。为了做出可靠的能量估计，为该数据集确定了场地校正和路径衰减。当比较浅层地震和深部地震的能量时，浅层地震表现出能量力矩比随着地震大小的增加而增加。而对于深源地震，能量弯矩比随地震大小变化不大。我们对1994年加利福尼亚州北岭地震的余震做了一些详细的研究。这项工作证实，对于加利福尼亚州的浅层地震，能量与力矩的比率随着地震规模的增加而增加。