震级

The amended results are: the name of this historieal earthquake is suggested to be Yanqing Haituo Mountain earthquake in Beijing; its occurrence time is in September of 294; its magnitude is estimated to be 6 and the epicentre to be at (115.83°E, 40.59°N) with a location accuracy of grade Ⅱ.

校订后的结果是：地震名称应为北京延庆海坨山地震，发震时间为公元294年9月，震级为6级，震中位置为115.85°E、40.59°N，震中误差为Ⅱ类。

Based on the data of 179 earthquakes from 1985 to 1990 in Shanghai and its adjacent area,for the records of the two bore-hole seismometers of Hongqiao and Nanhui seismic stations,we have studied how to determine the local magnitude by using the maximum amplitude of bore-hole velocity records.

根据上海台网观测记录到的上海及邻近地区1985年至1990年期间179次地震事件的资料，以虹桥台、南汇台的两口深井观测地震记录为例，探讨如何利用深井观测速度型记录的最大振幅来测定近震震级。

TheRichter Scale was devised by Charles Richter in 1935tocompare the energy level of earthquakes.

里氏震级是1935年查尔斯·里克特发明的，用来比较地震的能量等级。

The Richter Scale was devised by Charles Richter in 1935

里氏震级是1935年查尔斯。里克特发明的

Magnitude is the most common measure of an earthquake's size.

最常用的就是震级。

Through detailed analyzing some influencing factiors of sand liquefaction, seven parameters were selected as assessment indexes. They are earthquake magnitude, peak ground surface acceleration, standard penetration value, specific penetration resistance, relative compaction, average particle diameter, and water table. The extension assessment model has been established that was applied to assessment of sand liquefaction potential. The model had been trained by the historical data and has been assessed in virtue of sand liquefaction from the historical data by simulating, and got a excellent result. After introduction of the support vector machine theory, this paper established the assessment model of sand liquefaction based on the support vector machine, and assessed in sand liquefaction from virtue data of some fields in home and overseas with the tool Libsvm, which was programmed based on the support vector machine theory. And got a good coherency between the assessement results and the actual liquefaction.

在详细分析影响砂土液化因素的基础上，选取了震级M、地面最大加速度g_、标准贯入击数N_(63.5)、比贯入阻力P_s、相对密实度D_r、平均粒径D_(50)、地下水位d_w等7个参数作为评价指标，建立了砂土液化势的可拓评价模型，并对历史数据进行仿真评价，取得了较好的应用效果；在对支持向量机的理论进行介绍后，本文建立了基于支持向量机的砂土液化势评价模型，并利用在基于支持向量机理论的Libsvm软件，对若干国内外场地的现场实测数据进行了评价，评价结果与现场表现基本上一致。

While Indonesia is prone to frequent seismic activity, Sukanagara official Firman Edi says for his small village an earthquake of this magnitude is a rare occurrence.

尽管印尼地震活动频繁，但是苏卡纳加拉村官员艾地说，对于他这个小村庄来说，达到这样的震级的地震是罕见的。

The results show that the difference between upper magnitude threshold Mt used in the calculation and the maximum magnitude extrapolated from the linear relation of log N-M has an influence on the distribution of Y.

结果表明，计算样本的震级上限Mt 相对于logN-M关系中拟合线性外推最大震级MT的变化对Y的异常分布有一定影响，其影响随地震样本量从小到大而明显减小。

In chapter 4, yields of Chinese underground nuclear explosions are estimated by using amplitudes of Lg waves or Lg codas recorded by CDSN stations as well as stability of m〓 and mb is analyzed.

本文第四章由罗布泊地下核爆炸激发的Lg波及其波尾来估算这些爆炸的当量，并对均方根Lg波震级和Lg尾波震级的稳定性进行了分析。

According to a 2008 study by the U.S. Geological Survey, there's a more than 99% chance that a quake of magnitude 6.7 or higher will hit California over the next 30 years and a nearly 50% chance that a magnitude 7.5 or higher quake will hit the state over the same period.

根据2008年美国地震调查科的研究，有超过99%的机会一场震级为6点7级或者更高的地震来冲击旧金山在接下来的30年内有将近50%的机会一场震级为7点五级或者更高的地震在同一时期来冲击该地区。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。