震中

危地马拉救灾部门发言人米内尔（JohanaMiner）说，至少有48人遇难，其中大部分是在圣马科斯省（SanMarcos）。该省是沿海一个多山地带，位于震中附近。

At least 48 people were killed , mainly in San Marcos province , a mountainous coastal stretch that sits beside the epicenter , said Johana Miner , a spokeswoman at the Guatemalan disaster agency .

本文作者首先基于Voronoi图原理，采用网格搜索的方法分别得到了发生于2007年3月13日的顺昌地震及发生于2007年8月29日永春地震的震中位置。

Based on voronoi theory , the author use grid-search method to locate the epicenter of Shunchang earthquake happened in Mar 13th , 2007 , and Yongchun earthquake happened in Aug 29th , 2007 .

地震震中均被标示在一张世界地图上。

The earthquake centres had been plotted on a world map .

那次地震的震中位于首都东北200公里处。

The earthquake had its epicentre two-hundred kilometres north-east of the capital .

当离震中距离更大时，瑞雪波才变得显著。

At greater epicentral distances the Rayleigh waves become very prominent .

针对震中距的影响，主要分析了C类、D类场地。

In order to discuss distance influence , we analyze C and D site .

基于BP神经网络的近震中地震波和干扰波的识别

Distinguishing seismic wave and disturbing wave for local earthquake by BP neural net

由张北地震震中向SEE向延伸存在由强震构成的张家口渤海地震带。

There is Zhangjiakou-Bohai rupture belt , where many strong earthquakes occurred in history , extended along the SEE direction of Zhangbei earthquake epicenter .

利用多重分形维数谱估计的Hill方法，讨论了新西兰地震活动区地震活动的震源分布、震中分布以及时间间隔分布的多重分形特征。

Using the Hill estimator , general multifractal characteristics of events in the New Zealand area have been discussed .

用分布在北京地区各方位上，震中距在20°&100°范围内的120次远震在本区15个地震台上的P波到时，研究北京地区地壳和上地幔的三维速度结构。

By use of the teleseismic P arrival times at 15 stations of Beijing network for 120 events distributing over various azimuths , we studied the three-dimensional P velocity structure under Beijing region .

结果显示，在玛尼7.5级地震和江西九江5.7级临震前，震中周围出现区域性Z分量日变化幅度异常现象。

The anomalies of diurnal-variation amplitude near the epicentral area have been also studied before Mani M_S7.5 earthquake and Jiujiang M_S5.7 earthquake .

用AB连线与主震位置的关系判断未来主震的震中范围

Judgement the epicentral range of coming main shock by the rela-tion of AB linked line and main shock location

对震中距20°~60°的9次远震P波波形三分向记录，采用接收函数法反演了地壳和上地幔的S波速度结构。

The method of receiver function is used for nine high quality P wave recordings with three components at distance of 20 °~ 60 ° to inverse vertical distribution of shear wave velocity beneath the station .

此外，还通过P波初动极性分析的方法认为两次主震破裂面的走向略有差别，与余震序列精确定位结果显示的余震区震中分布一致。

In addition , it is also to be found that the strike directions of two rupture zones might vary slightly analyzing initial motion of P wave , coinciding with the relocated results of aftershock zones .

此次地震的震中接近珠峰大本营（EverestBaseCamp）。在4月25日发生的地震引发的雪崩导致18名登山人员丧生后，珠峰大本营的人员已经撤离。

The quake 's epicentre was close to Everest Base Camp , which was evacuated after an avalanche triggered by the April 25 quake killed 18 climbers .

中强地震前，在距震中较近的观测台站，能观测到Hg异常，相同条件下的Rn异常则不明显。

Before moderate and strong earthquakes , the stations near epicenter can observe anomaly for Hg and can not get obvious anomaly for Rn .

总结出震级M＿L、震中距、周期和最大S波振辐之间的关系。

Relations of magnitude M , epicentral distance , period and maximum amplitude of space were summarized .

各台P波到时残差下降；有近10%的地震震中位置移动了10km以上，它们多位于北京地震遥测台网边缘地区。

For nearly 10 per cent of the relocated hypocenters , which are mostly in border region of the area covered by the Beijing Telemetered Seismic Network , have been shifted more than 10km .

对震中距25°~35°且记录良好的5次地震的ScS震相，采用旋转相关函数法反演了岩石圈的剪切波分裂参数。

The approach of rotated correction function is applied to five satisfactory ScS wave recordings at distance of 25 °~ 35 ° to inverse shear wave splitting parameters of lithosphere .

异常比较集中，都分布在300km内，且多在震中以南地区。

Anomalies were centralized , all distributed within 300 km , and many distributed in the south of epicentral area .

CORA-3方法可以通过识别的示性特征给出震中地区的地质背景及其相应的图象。

CORA-3 and the revised CORA-3 methods can give the epicentral geological interpretation and its related patterns through recognized displaying features .

分析日本4次地震前5个电离层垂测站资料，发现地震前后震中附近夜间电离层偶发E层的临界频率f0ES值多数呈下降趋势，少数呈增加趋势。

The data of 5 ionospheric vertical sounding stations before 4 earthquakes in Japan are analyzed . It is found that most of the critical frequencies of the E sporadic layer tended to decrease and the only few tended to increase around the epicenters before and after the earthquakes .

结果表明，位于发震断裂的固原点的气Rn、Co2及距震中最近的古浪点气Hg、H2的中长期异常和短临异常都十分突出。

Tha results show that the gases Rn and CO_2 at Guyuan site on the earthquake generating fault and gases Hg and H_2 at the nearest Gulang site from seismic center have very distinctive medium long term , short term and impending earthquake precursors .

利用通常地震定位方法所确定的爆炸地震震中位置和实际震中存在20～30km偏差。

It has been found that epicenters located by usual seismic location method deviate from real epicenters . The deviation of distance is about 20km to 30km .

震中附近的3个地震台记录的S波偏振方向在5.4级地震前出现由原来与区域应力场一致的NE向转为NW向震后又转回NE向。

Before the shock , the S-wave polarization direction that recorded by 3 stations around the epicenter turned to NW from NE consistent with the direction of regional stress field ; but after the shock , it turned to NE again .

结果表明，川滇地区72%的M≥6级地震前1～2a，在未来震中周围均有GL值异常出现，用R值对其进行评分，可以通过检验。

The results show that the anomaly of GL values would appear around the coming epicenters 1 or 2 years before 72 % of M ≥ 6 earthquakes in the Sichuan-Yunnan region . It can pass the check if using R value to grade .

结果表明：加卸载响应比阈值P0（Z）和响应比月均值PM（Z）的大小与地震的震级、震中距及异常出现的早晚并非完全呈线性相关；

The results show that it is not a complete linear correlation between the threshold value P0 ( Z ) or PM ( Z ) and the seismic magnitude or the epicentral distance or the occurrence time of anomalous P ( Z ) and PM ( Z ) .

以外围区100～200km中短及短期异常为主，而震中100km内的近源区异常并不显著；

The medium-and short-term or short-term anomalies mainly appeared in the periphery of 100 ~ 200 km from the epicenter , but the anomalies near the source area ( < 100 km ) are not significant ;

根据天水地震台SK地震仪近年来记录的338个震例的资料，用最小二乘法求出最大振幅面波与初至波到时差同震中距的关系式，并与JB表进行了对比。

According to records of 338 earthquakes in recent years by SK seismograph of Tianshui seismic station , a formula of relationship between travel time difference of maximum surface wave from primary wave and epicentral distance is given by least squares method .

地形变和地磁异常也观测到了.分析发现：前兆不是沿断裂带分布，而主要是位于近震中（≤50km）的破裂面法线方向；

It is found that the precursors had not distributed a-long rupture zones , but mainly in the normal direction of fracture plane near the epicenter (≥ 50 km ), the focus is not on early fracture .