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Silent earthquakes occurring in a stable-unstable transition zone and implications for earthquake prediction

机译：稳定不稳定过渡带中发生的无声地震及其对地震预报的意义

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In the past decade, nine silent earthquakes were documented along the Nankai and the Sagami Troughs in Japan, which form the northwestern margin of the Philippine Sea plate. They occurred in the stable-unstable transition zone at depths of around 30 km on the subduction interface and were segregated from major asperities of the 1923 Kanto, the 1944 Tonankai and the 1946 Nankai earthquakes. Their equivalent magnitudes were less than 7 and overall slips were less than 0.2 m, one-order smaller than those of the major asperities of ordinary great earthquakes. Moment release rates of the silent earthquakes were less than 10(14) Nm/s, five-orders smaller than 10(19) Nm/s of the great earthquakes. Two methodologies are attempted to obtain order of magnitude estimates of the roughness and friction parameter of source areas of some of the silent earthquakes. One method compares observed waveforms to synthetics with an empirical source time function based on laboratory experiment. The other relates sizes of silent earthquakes to the friction parameter a-b.
机译：在过去的十年中，日本的南海海峡和相模低谷记录了九次无声地震，这些地震形成了菲律宾海板块的西北边缘。它们发生在俯冲界面上约30 km深度的不稳定不稳定过渡带中，与1923年关东，1944年Tonankai和1946年Nankai地震的主要凹凸不平分开。它们的等效震级小于7，总滑移小于0.2 m，比普通大地震的主要凹凸小一阶。无声地震的矩释放速率小于10（14）Nm / s，比大地震的10（19）Nm / s小五阶。尝试了两种方法来获得一些无声地震震源区域的粗糙度和摩擦参数的数量级估计。一种方法是根据实验室实验将观察到的波形与具有经验源时间函数的合成波形进行比较。另一个将无声地震的大小与摩擦参数a-b相关。

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