科学家根据地震波的强度和持续时间把地震强度分为了不同的等级。
Scientists assign a magnitude rating to earthquakes based on the strength and duration of their seismic waves.
这导致(民众)比想象中更为紧张，(因为)在最坏的情况下，下一次地震可能是1857年地震的两倍强度。
This means that more tension has accumulated than previously thought; in the worst scenario, the next quake could be twice as strong as the 1857 one.
在今天早上袭击日本的8.9级的地震是强度最大的板块叠加的结果：几个专家称他们可以推断出在日本最近的一次相似烈度的地震发生在公元869年。
The shock of the magnitude-8.9 earthquake that hit Japan this morning was its sheer intensity: Several experts have hypothesized that the last one of this magnitude struck Japan in 869 C. E.
在今天早上袭击日本的8.9级的地震是强度最大的板块叠加的结果：几个专家称他们可以推断出在日本最近的一次相似烈度的地震发生在公元869年。
The shock of the magnitude-8.9 earthquake that hit Japan this morning was its sheer intensity: Several experts have hypothesized that the last one of this magnitude struck Japan in 869 c.e..
影响地震强度的一个因素是人们感觉到地震影响的震中距离。
One factor that influences earthquake intensity is thedistance to the epicenter of those who feel the earthquake's effects.
影响地震强度的一个因素是人们感觉到地震影响的震中距离。
One factor that influences earthquake intensity is the distance to the epicenter of those who feel the earthquake's effects.
他说，“我们可能会感受到高达4级强度的地震，就像最近每两年我们就会经历的，而5级强度的地震估计每20年发生一次。”
"We can expect to see quakes up to magnitude 4 - such as the recent ones we've experienced - every two years," Prof Sandiford said. "magnitude 5 quakes can be expected every 20 years."
虽然除了1906年旧金山7.8级大地震外，美国本土还没有发生过比这更强烈的地震；但在印度尼西亚，这只能算是中等强度的了。
Although it was stronger than any earthquake in the continental United States since the Great San Francisco earthquake of 1906 (magnitude 7.8), it was modest by Indonesian standards.
美国研究人员最近发现了通过分析地震发生之初的前几秒的震波大小，便可以断定出地震最终强度的方法，从而为未来总有一天能够早些提供地震警报迈出了一步。
Scientists have found a way to estimate an earthquake's ultimate strength by analyzing the initial seconds of a rupture -- a step that could one day provide early earthquake warning.
Vidale说：但是这些研究所能做出的预测仅限于底层活动所导致地震的频率以其强度，而不能预测出任何一个单一的地震事件的发生。
But such hazard predictions can go only so far, Vidale says. They can warn how often and how strongly the ground will shake, but they can't forecast the magnitude of any single event.
这一响声是iPhone的一款应用程序发出的紧急地震警报，让用户知道地震何时会来临，震中在哪个位置，以及地震强度有多大。
The sound is an emergency earthquake warning from an iPhone app that lets subscribers know when the quake will come, where the epicenterwill be located and how strong the shaking will be.
地震学家巴里·赫尔(Barry Hull)说，如果7级强度的地震震中是距离墨尔本商务中心区的50公里范围内，就可能导致大范围的建筑物毁坏，特别是那些高达四层楼的老建筑物。
Seismologist Barry Hull said a magnitude 7 quake with an epicentre within a 50km radius of Melbourne's CBD would cause extensive structural damage, particularly to older buildings up to four storeys.
这样一种在海下的延伸性地理结构引发了此次世界范围内最强烈的地震，与1960年智利9.5级地震和2004年苏门答腊9.1级地震强度接近。
That process of subduction triggers the largest earthquakes in the world, such as the magnitude-9.5 Chilean quake in 1960 and the magnitude-9.1 Sumatran quake in 2004.
当地时间周六凌晨3：30左右，里氏8.8级的地震袭击了智利，这也是有地震记录以来强度第五大的地震。地震造成了建筑物倒塌，道路被扭曲，电力和通讯中断。
Saturday's 8.8-magnitude quake in Chile — the fifth-biggest ever measured — struck around 3:30 a.m. local time, toppling buildings, contorting roadways and cutting power and communications.
这些核电站能在里氏9.0级的地震中幸存下来，即相对损失较小。 而且还要考虑到地震规模的对数性质，这次地震的强度是设计强度的15倍多，这似乎是一个奇迹。
That they survived relatively unscathed through a magnitude 9.0 earthquake—ie, one that, given the scale's logarithmic nature, was approximately 15 times more powerful—seems remarkable.
看起来NASA已经放出了试探性的气球，暗示了智利地震强度如此大，它本身就引起了一波更大更频密的地震。
It seems that NASA is already floating a trial balloon insinuating that the Chile quake was so large that it will, by itself, begin a wave of larger and more frequent quakes.
地震影响场反映了地震动强度的空间分布或与空间相关的地震动场。
The seismic influence field reflects the space distribution of seismic intensity or space-related seismic ground motion field.
地震序列模型确定了断层带内中强以上地震的时间、强度和位置三方面的非随机性，从而导致了地震序列的特定性。
The earthquake sequence model defines the nonrandomeses moderate earthquake in time, intensity and location, thus leading to determination of the earthquake sequence within the fault zone.
同时，由于地裂的存在及形成又使得在地震时耗散更多的能量，从而使得地面地震动强度减小。
On the other hand, because the ground rupture can absorb abundant energy during earthquake, the earthquake impact on the ground will be consequently reduced.
概率地震需求分析的主要工作是获得不同地震动强度水平下结构地震需求的概率分布。
The main work of probabilistic seismic demand analysis is to obtain the probabilistic distribution of structural seismic demand at different intensity of ground motions.
因此，研究实际地震动时程强度包络函数的特性，对合理模拟地震动时程具有重要的意义。
So studying of the envelope function of the practical ground motion acceleration records is very important.
有一点需要注意：如果一次地震的里氏震级定为4级，说明该地震的强度比定为里氏3级的地震大九倍。
It is important to note that a reading of 4 indicates an earthquake ten times as strong as one with a reading of 3.
建筑结构地震灾害损失的大小与地震发生的概率及强度、结构的抗震能力有密切的关系。
The earthquake damage to building structure is closely related to the probability of earthquake occurrence, earthquake intensity and structure resistance.
影响地震强度的一个因素是人们感觉到地震影响的震中距离。
One factor that influences earthquake intensity is the distance to the epicenter of those who feel the earthquakes effects.
这次芮氏6.2级地震的震央是巽他海峡的海底．有关官员说，这种强度的地震能够引发海啸，但没有表示海啸即将来临。
The six-point-two-magnitude earthquake was centered beneath the Sunda Strait. Officials say earthquakes of this strength can trigger a tsunami, but gave no indication that one is imminent.
为进行地震危险性分析，确定未来可能发生地震的地段和强度是极为重要的。
So in analyzing the danger coefficient of earthquakes, it is very important to ascertain the locations and scale of earthquakes that will occur possibly in the future.
为进行地震危险性分析，确定未来可能发生地震的地段和强度是极为重要的。
So in analyzing the danger coefficient of earthquakes, it is very important to ascertain the locations and scale of earthquakes that will occur possibly in the future.
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