the ratio precursory anomaly is 40% for seismology parameter of the epicenter area in 2 years before the main shock.
震前2年左右,震源区附近地震学参数异常比较明显,异常项数比40%;
after the earthquake, a temporary digital network with 6 detectors around the epicenter area was set up.
震后围绕震中区架设了一个由6套拾震器记录仪组成的临时数字地震台网。
these sequences can be divided into two groups:group 1 includes 5 sequences of which the direction of major axis of the epicenter area is parallel to the strike of the subduction zone;
主震的震源机制受俯沖带的走向、倾向和倾角的控制。但是这些地震序列又分为两种情况:(1)有5个地震序列,其震中分布区域的长轴走向和俯沖带的走向相同;