他们的房子修建得很坚固，经受住了主震。
Their house, which was solidly built, resisted the main shock.
信号震和主震沿同一构造体系活动；
Signal earthquake and the major earthquake seem to be controlled by the same structural system.
地震序列类型为前震—主震—余震型；
据估计主震区的震级有6。
主震后又有无数次余震，最大余震超过7级。
Numerous aftershocks were recorded with one having a magnitude greater than 7.
进而分析研究了诱发信号震与后续主震的关系。
The relation between the signal inducing earthquakes and succeeding strong earthquakes is studied.
余震可以在主震发生后的一个月或者几天之内发生。
It can happen with a month, or within days, from the main shock.
主震后15天内最大近震的应变能量和发震时间。
The strain energy of the near maximum shock occurred within 15 days after the main shock.
本文讨论了地震序列中前震、主震和余震的烈度。
This paper discusses the intensity of the earthquake sequences, which include the foreshock, main shock and aftershock.
已经受损的建筑物会因主震后的余震而进一步损坏。
Damaged buildings may be destroyed by aftershocks following the main quake.
该结果对主震和最大余震的预测具有一定的参考价值。
This result has a certain reference value for forecasting of main shock and the maximum aftershock.
但余震震级大于主震，这实属罕见，虽然之前也听说过。
It is rare, though not unheard of, to have an earthquake followed by a larger aftershock.
后者来自主震当时的观察发现，有力的支持了空穴理论。
The latter observations, resulting from one observer being in the right place at the time of the main shock, strongly support the positive hole theory.
丽江70级主震是一个单侧破裂过程，其过程非常复杂。
Last, the m 7 0 Lijiang earthquake is a complex unilateral rupture process.
与唐山主震震源机制解结果和野外宏观考察结果基本一致。
It is essentially consistent with the results from the earthquake source mechanism solution and the results of field macroscopic observations of the main Tangshan earthquake.
通常余震比主震弱，但是，在主震中受损的建筑往往因余震倒塌。
Aftershocks are generally weaker than the main quake, but buildings that have already been damaged are prone to collapse in an aftershock.
大震后有60%的强余震与主震发震时刻的倾斜固体潮背景相同。
The background of tilt earth tide of 60% strong aftershocks after large earthquakes is similar to that of main shocks at the original times.
因此认为，最大余震可能是由主震引起的库仑破裂应力变化触发的。
Therefore, the largest aftershock was probably triggered by the Coulomb failure stress change.
北北东—南南西向分布的余震发生在主震的断层面上（或其附近）；
The NNE-SSW distributed aftershocks occurred on, or near, the fault plane of the main shock;
主震后，由于释放了绝大部分应力，余震序列则表现为低应力破裂过程。
After the main shock, most of the stresses have been released, so the aftershock sequences show a rupture process of lower stresses.
这些余震虽然一般较主震为弱，但也足以造成进一步损害，并使建筑物更脆弱。
These secondary earthquakes are usually less violent than the main quake, but they can be strong enough to cause additional damage and weaken buildings.
很多混凝土大坝也受到主震后发生的高强度的余震的震动，也没有受到叠加损坏。
Many concrete DAMS have also been shaken by high intensity aftershocks that occurred after the main earthquake without any additional damage.
地震震级为7.7，专家们称其为一次主震，这是科学家们所使用最高的震级。
The quake had a magnitude of 7.7, that's what experts call a major earthquake, one of the highest magnitude classes that scientists use.
主震后不到一个小时的时间里，又发生了两次余震，一次5.0级，一次5.2级。
Within an hour after the main shock, two aftershocks, one of magnitude 5.0 and the other 5.2, occurred.
汶川地震的主震发生在具有右旋性质的仰冲型断层带上，震源深度为15公里左右。
The main shock occurred on the dextral obduction-type fault zone and the hypocenter depth was about 15km .
一般来说余震代表发生主震的断层的微小重调。余震的发生频率随着时间慢慢减小。
As a general rule, aftershocks represent minor readjustments along the portion of a fault that slipped at the time of the main shock.
由此推测，主震的错动面为北西西走向，可能是高倾角的左旋平移断层的滑动结果。
From this, it has been inferred that the strike of the dislocating fault plane of the main shock is NWW. It seems to be a left lateral horizontal slip fault with high dipping Angle.
此外，强震的余震多为中小地震，大量中小余震可为主震发震机理研究提供重要信息。
Moreover, most aftershocks of strong earthquake are small and moderate events, which provide important information on focal mechanism of mainshock.
余震发生在主震的断层面上(或其附近)，是由主震断层面附近介质的应力调整造成的。
The aftershocks were distributed on (or near) the fault plane and were triggered by the stress redistribution in the medium in the nearby region of the fault plane.
本次4.9级地震作出的震源机制解显示为走滑型，与1969年主震的情况较为类似。
The focal mechanism of the M4.9 earthquake shows that it belongs to strike slip type that is similar to the M6.4 earthquake in 1969.
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