• 首页关于本刊投稿须知期刊订阅编委会期刊合作查询检索English

查看全文   查看HTML全文 下载PDF阅读器  

  翟璐媛,杨陈.使用P波快速测定国家台网大震标准震级[J].震灾防御技术,2015,10(2):378-387, DOI:10.11899/zzfy20150218.

使用P波快速测定国家台网大震标准震级
摘要:    本文针对国家台网速报面波震级测定时间偏长和中深源地震震级速报有一定偏差的问题,采用IASPEI推荐的宽频带体波震级mB及宽频带P波矩震级MWP对2009—2013年国家台网地震速报的大震进行了对比分析。对于经过转换成MW后的mB和MWP震级来说,其结果均与我国速报地震发布的震级M有一定的偏差,一般表现为偏小。其中,对于6.0—6.9级地震,mB偏差相对较小,但离散度相对较大(整体偏差要比平均偏差大不少);对于7.0—7.9级地震,MWP偏差相对较小;而对于8.0级以上地震,由于震级饱和等原因,mB偏差较大,但MWP偏差相对较小,一般主要表现为偏小。总体来说,MW(MWP)的稳定性要比MW(mB)更好一些(线性回归的相关系数更大,标准误差更小)。对于综合mB和MWP震级来说,由于采取分段平均的方法,结果的稳定性有了一定的提高,但较大地震仍以偏小为主,如果在综合震级MP上加0.2,则可以得出与M震级较为接近的结果。通过MW(mB)、MW(MWP)、MP(M)、M与MW(GCMT)的对比,可以验证综合标准震级MP(M)和国家台网速报震级M具备一定的可信度,而MP(M)可作为P波快速测定的震级,所以用MP(M)作为大震速报初报震级,在某种程度上是可行的。
作者单位
翟璐媛 中国地震台网中心北京100045 
杨陈 中国地震台网中心北京100045 
关  键  词:P波震级  体波震级mB  宽频带P波矩震级MWP  标准震级M
DOI:10.11899/zzfy20150218
基金项目:中国地震局测震台网青年骨干培养专项(20130217)
收稿日期:2014-12-05
作者简介:翟璐媛,女,生于1982年。2006年毕业于中国科技大学,工程师。主要从事地震监测及台网管理等工作。E-mail: zly@seis.ac.cn
通讯作者:杨陈,男,生于1979年。高级工程师。主要从事地震监测与地震预警方面的研究。E-mail: yangchen@seis.ac.cn
Rapid Determination of Standard Magnitude in National Network by Using P Wave
Abstract:      Usually the determinate time of surface wave is long and the magnitude of deep source earthquake is instable when National network earthquake information releases. In order to solve this problem we used body wave magnitude mB which IASPEI recommends and broadband P wave moment magnitude MWP contrast the standard magnitude M which National network determinate during 2009—2013. For the converted magnitude MW by mB and MWP, the results have a certain deviation to National network earthquake information releases standard magnitude M, are characterized by small. For magnitude from 6.0 to 6.9, mB deviation is relatively smaller, but the discrete degree is relatively larger (the overall deviation is greater than the average deviation); for magnitude from 7.0 to 7.9, MWP deviation is relatively smaller; for the magnitude more than 8.0, due to the reason such as magnitude saturation, the deviation of mB is relatively larger than that of MWP, but is still smaller than M. In general, the stability of MW (MWP) is better than MW(mB) (the linear regression correlation coefficient is bigger, and the standard error is smaller). For the magnitude comprehensive mB and MWP, due to the piecewise average method, the stability of the results is improved in certain degree, but is still smaller for large earthquakes. If add 0.2 to the comprehensive magnitude MP, we can get results close to the standard magnitude M. By comparison with MW (GCMT),we can verify MP(M) and M(CENC) have a certain degree of credibility. MP(M) as a rapid determination of P-wave, serve as a preliminary result of quick report of great earthquake is also possible.
Keywords:  P wave magnitude  Body wave magnitude mB  Broad band P wave moment magnitude MWP  Standard magnitude M
关闭