南昌台P波精度和震级偏差研究  

Study on P-wave Precision and Magnitude Deviation of the Nanchang Seismic Station

作　　者：查小惠 杨雪超 赵爱平 鲍志诚 吕坚 

机构地区：[1]江西省地震局,南昌330039

出　　处：《华北地震科学》2016年第4期73-76,83,共5页North China Earthquake Sciences

基　　金：地震科技星火计划项目(XH15024Y);地震行业科研专项(201508020-05);地震监测;预测;科研三结合课题(161404)

摘　　要：选取震中距在0°-40°的1024个地震,统计南昌台P波走时残差和Ms震级偏差的分布情况.结果表明：P波走时残差受方位角和震级大小影响明显,其中东北方位走时残差最大,达2.8s,东南方位最小,为1.1s,震级越大,走时残差越稳定;震级偏差受方位角影响明显,方位角在东北、东南方位时,南昌台定位震级比国家台网测定震级偏低0.12左右,而在西南方位则比国家台网震级偏高0.08左右;没有发现震源深度对P波走时残差和震级偏差的明显影响.The distribution of the P-wave travel time residuals and the Ms Magnitude deviation of the Nanchang station were analyzed based on the 1024 earthquakes whose epicenter distances are between 0° and 40°. The results show that the P-wave travel time residuals were obviously affected by the azimuth angle and magnitude. The travel time residuals is up to 2. 8 second within the Northeast azimuth, while the travel time residuals meet the minimum of 1. 1 second at the southeast direction. The magnitude deviation is also obviously influenced by the azimuth angle. The magnitude obtained from Nanchang Station in the southeast and the northeast direction is about 0. 12 lower than that of the national network, while in the southwest is about 0. 08 higher than that of the national network. There is no obvious relationship between the focal depth and the P wave travel time residuals and the magnitude deviation.

关 键 词：P波精度 震级偏差 反方位角 震中距 

分 类 号：P315.6[天文地球—地震学]