分析了哈佛大学CMT目录中矩心距小于100 km的全球所有M_W≥7.5的浅源地震对,发现多数这些地震对的震源机制都相似。由于这些地震的震源区直径一般应超过100km,因而其破裂带明显相交。由于所有地震对的时间间隔较短,因而板块无法累积到再次发生运动所需的应变量。这些观测结果与准周期复发模型非常矛盾,而准周期复发模型正是地震空区假设的基础。复发周期呈幂律分布的模型与这些地震的观测结果更接近。 We analyzed all the earthquakes with M_W ≥7.5 in the CMT catalog of Harvard University with centroid distances less than 100 km and found that most of these earthquakes had similar focal mechanisms. Since the focal zone diameter of these earthquakes should generally exceed 100 km, the rupture zones obviously intersect. Due to the short time interval of all pairs of earthquakes, the plate can not accumulate the amount of strain required to re-occur. These observations are very contradictory to the quasi-periodic recurrence model, and the quasi-periodic recurrence model is exactly the basis for the hypothetical earthquake zone. The model with a recurrence period with a power law distribution is closer to the observations of these earthquakes.