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最近观测到的异常地震事件——深部低频地震和颤动、甚低频地震及慢滑动事件——形成了慢震群,而这个慢震群受控于不同于普通地震的标定律。根据这个标定律,我们在日本西部的纪伊半岛下方观测到了之前未知的事件,其震源持续时间约20～200s,矩震级为3～4级。这些地震在2～8Hz的频带范围内辐射能量,直接与其地震矩率成比例,但这个比例常数比一般地震小4～5个数量级。这个地区的慢地震可能是由大量的剪切滑动事件组成的,从地震方法上看,总体上会呈现为颤动或长达200s持续时间的较长独立事件,从大地测量方法上看,是慢滑动事件。
Recently observed anomalous earthquakes - deep low frequency earthquakes and tremor, very low frequency earthquakes and slow slip events - have formed a slow swarm of swarms, controlled by a calibration law different from ordinary earthquakes. According to this calibration law, we have observed previously unknown events below the Kii Peninsula in western Japan with a duration of about 20-200s and a moment magnitude of 3-4. These earthquakes radiate energy in the frequency range of 2 ~ 8Hz, which is directly proportional to the seismic moment rate. However, this proportionality constant is 4 to 5 orders of magnitude smaller than the general earthquakes. The slow earthquakes in this area may be composed of a large number of shear-slip events. Seismic methods generally present a long independent event of tremor or up to 200 s in duration, which is slow in geodetic terms Sliding event.