S‐wave energy estimation of small‐earthquakes in the western Nagano region, Japan
S‐wave energy estimation of small‐earthquakes in the western Nagano region, Japan
复制标题
日本长野西部地区小地震横波能量估算
DOI：
10.1029/2003gl018445
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发表时间：
2004
影响因子：
5.2
通讯作者：
S. Horiuchi
中科院分区：
文献类型：
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作者：
T. Matsuzawa;M. Takeo;S. Ide;Y. Iio;Hisao Itô;K. Imanishi;S. Horiuchi
我们估计了发生在日本长野西部地区的9次小地震（MW 1.2-2.4）辐射的S波能量。首先，我们在频域中获得了156次60 Hz以下地震（MW 0.8-2.6）辐射的S波能量。我们使用最小二乘反演方法分离辐射能量谱和场地放大函数，包括对震源处S波辐射图和沿路径沿着衰减的校正。然后，我们假设一个ω2-模型来确定9个地震的拐角频率，使用经验绿色函数（EGF）方法来消除场地和衰减的影响。使用所获得的拐角频率，然后我们使用这些源模型计算辐射能量高于60 Hz。我们的结果表明，地震矩与S波能量的比值在8 × 10−6和7 × 10−5之间。
We estimate the S‐wave energy radiated by nine small earthquakes (MW 1.2–2.4) that occurred in the western Nagano region, Japan. First, we obtain the S‐wave energy radiated by 156 earthquakes (MW 0.8–2.6) below 60 Hz in the frequency domain. We separate the radiated energy spectra and the site amplification functions using a least squares inversion method including corrections for the S‐wave radiation pattern at the source and the attenuation along the path. Then, we assume an ω2‐model to determine the corner frequencies for the nine earthquakes by using an empirical Green's function (EGF) method to remove the site and attenuation effects. Using the obtained corner frequencies, we then calculate radiated energy using these source models above 60 Hz. Our result indicates that the ratio of the seismic moment and S‐wave energy is between 8 × 10−6 and 7 × 10−5.
茂树；堀内：J.Phys.Earth。
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