震源

We calculate the angles between the P axis and the T axis of two focal mechanism solutions in 3 dimensions, and take the sum of two angles as the distance. By using the system cluster method, the classification of focal mechanism solutions has been carried out.

计算2个震源机制的2个 P 轴在三维空间中的夹角和2个 T 轴之间的夹角，再以2个夹角之和作为距离，采用系统聚类的方法对大量地震震源机制解进行分类。

The fault-plan solutions for the two events of the injection-induced microearthquakes were determined by using the first-motion′s direction of P waves from records of the KTB surface stations the focal mechanism at 5.1 km: the nodal planes Ⅰ, strike 30°, dip 46°, slip 10°; the nodal planes Ⅱ: strike 293°, dip 83°, slip 136°; T-axis: azimuth 241°, plunge 35°; P-axis: azimuth 349°,plunge 24°.

用KTB地面台网记录的资料和P波初动方向得到了这次注水诱发地震中两个大地震的震源机制解。其中震源深度为5.1km的地震，其节面Ⅰ参数为：走向30°，倾角46°，滑动角10°；其节面Ⅱ参数为：走向293°，倾角83°，滑动角136°；T轴方位角：241°，倾角：35°；P轴方位角：349°，倾角：24°。

Also it is the headwaters of producing seismic signal.

可控震源是在城镇人口稠密区不允许使用冲击震源的前提下实现无损探测的有效设备。

Some digital records were obtained from 4 small earthquakes, precise hypocenter locations were determined from arrival times an...

利用这些小地震活动期间所得到的数字记录确定了4次小地震震源的精确位置，利用矩张量反演方法求解了这几个地震的震源机制。

The depth of hypocenter for most earthquakes located with relative locating method is at about 10-12km.

分析认为：事件通过相对定位法修订震源位置，绝大多数地震的震源深度在10~12km。

In this paper, the problem of simultaneous inversion for earthquake location and velocity structure is discussed, and the difficultes encountered in the inversion are discussed.

本文讨论并处理了震源位置和速度结构联合反演中的问题和困难。正交投影算子的引入不仅使这一问题的数学描述简洁，物理解释清楚，而且参数分离之后，与震源有关的方程组是相容的。

The directions of seismic source rupture for 151 historical moderate strong earthquakes occurred in Yunnan region have been determined by using aftershock sequence data and isoseismal line data.

利用等震线和余震序列资料，主要研究了云南地区 1 51次中、强震的震源破裂方向资料，给出云南地区中强地震震源破裂的空间展布图像。

The authors replotted the isoseismals of this event based on checking historical earthquake records,in which the intensity value of the innermost isoseismal is Ⅷ.We concluded that the depth of this earthquake is from 15km to 18km.

以该地震内圈等震线的几何中心为震中，根据梅世蓉-萨瓦连斯基有关震中烈度、震级和震源深度之间的统计关系，以及谢毓寿的统计结果，得到的震源深度为15～18km。

In this paper,we use the data of JiaShi earthquake sequence which was recorded by KAS station and WUS station of the regional digital station network in XinJiang near source region. We have calculated moment tensor solutions of more than 100 Ms≥3.5 earthquakes from 2001 to 2004 by the body waveform inverse. At the same time,we compared our result with Harvard CMT result.

本文利用新疆区域数字化地震台网中近震源周围的喀什、乌什两个台记录到的伽师地震序列的波形资料，使用波形拟合反演方法分别计算了该区域2001-2004年的100余个Ms≥3.5地震的矩张量解，得到了一系列的震源参数。

When the nonlinear layer which has weak nonlinearity is thin and far away from the seismic source which be low energy, compared with the corresponding results in linear antis, the medium nonlinearity produces abort 1/10~1/4 and 1/10~1/3 differences of instantaneous dominant frequency aid bandwidth. These instantaneous feature differences of seismic waves induced by the nonlinearity of media become weaker and weaker with the decrease of source energy. However, with the increase of the wave travel path within the mummer layer, the nonlinear accumulation effect could still keep such phenomena as the waveform distortion and instantaneous dominant frequency and bandwidth variations in records.

在本文给定的弱非线性介质中（非线性炽较薄且远离震源），在震源能量较低的情况下，介质的非线性效应会造成地震波瞬时主频和频宽相对于线性介质情况分别为1/10~1/14和1/10~1/3左右的变化量此外，随着入射波能量的下降，介质非线性所造成的地震波瞬时特征的变化量减小，但随着地震波在穿越非线性介质时路径的加长，非线性作用的累积效应使得波形畸变和频率分布特征的变化等现象得以维持。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐