| 潮汐应力对地震的触发作用 |
| |
| 引用本文： | 丁中一,贾晋康,王仁.潮汐应力对地震的触发作用[J].地震学报,1983,5(2):172-184. |
| |
| 作者姓名： | 丁中一 贾晋康 王仁 |
| |
| 作者单位： | 北京大学地质系 |
| |
| 摘 要： | 文中计算了由日、月引潮力在地球内产生的潮汐应力场,研究了潮汐应力对地震的触发作用.采用的地球模型是分为十五层的球对称模型.对于近30年来我国或我国邻近发生的七十次较大的地震,计算了震源处在发震时刻的球坐标系中的潮汐应力.通过坐标变换,得到了发震断层面中的正应力及沿错动矢量方向的剪应力.根据岩石的库仑剪破裂准则来判断潮汐应力对所研究的震例是否具有触发作用.结果表明,在七十个震例中,潮汐应力对其中四十三个有触发作用.对于华北地区的十八个震例,潮汐应力对其中十四个有触发作用.还可看出,对于浅源走滑型地震有较明显的触发作用,而对浅源斜滑及倾滑型地震则没有明显的触发作用.对国外七十二个震例的计算结果得到了类似的结论.最后,对华北地区中任一可能的发震地点,提出一种根据潮汐应力来预测发震的危险时间范围的方法.
|
SEISMIC TRIGGERING EFFECT OF TIDAL STRESS |
| |
| Affiliation: | Department of Geology, Peking University |
| |
| Abstract: | The tidal stress field of a layered spherically symmetric Earth due to the Sun and Moon is used to investigate its relation with earthquake occurrence. For the 70 strong earthquakes occurred during the last 24 years in or near China, we computed the tidal stress in spherical polar co-ordinate at the focus at the time of occurrence. The normal and tangential stress components along the slip direction on the earthquake fault plane are then found by co-ordinate transformation. Coulomb's criterion of shear fracture is used to determine whether these stress components will trigger the earthquakes or not.The results show that among the 70 earthquakes, 43 have had triggering effect and for the 18 events occured in North China 14 of them have had triggering effect. It may be concluded that for shallow strike slip earthquakes there are significant triggering effect, while for oblique slip and dip slip earthquakes tidal stress has very little triggering effect. From 72 events occurred over other parts of the world similar conclusion is obtained.Finally, for the purpose, of earthquake prediction, a way in finding a time interval during which the tidal stress may trigger earthquake on possible faults in North China is suggested. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地震学报》浏览原始摘要信息 |
|
点击此处可从《地震学报》下载全文 |
|
