An Improved Method to Determine Coda‐        <fi >Q</fi>Q        , Earthquake Magnitude, and Site Amplification: Theory and Application to Southern California

Wang W.; Shearer P. M.

摘要

Abstract > Seismic coda waves can be used to constrain attenuation, estimate earthquake magnitudes, and determine site amplification factors. We have developed a new multistation and multievent method to determine these three important seismic parameters simultaneously. We analyze 642 representative local (≤100 km) and shallow (≤20 km) earthquakes with catalog magnitudes between 1.8 and 5.4 in southern California at multiple frequency bands centered at 1.5, 3, 6, and 12 Hz. We find that the length of the moving average time window can affect the measurement of coda attenuation <fi>Q</fi> <sub> <fi>C</fi> </sub> , but our tests indicate that the optimal window length is about 15 times the dominant data period. We use linear regression to fit each coda section and use only those portions that agree with the model decay rate with a correlation coefficient larger than 0.9. For a frequency‐dependent coda‐ <fi>Q</fi> <sub> <fi>C</fi> </sub> model ( <fi>Q</fi> <sub> <fi>C</fi> </sub> = <fi>Q</fi> <sub>0</sub> <fi>f</fi> <fi>n</fi> ) at 1‐Hz reference frequency, our results yield estimates for <fi>Q</fi> <sub>0</sub> and <fi>n</fi> of 107–288 and 0.42–1.14, respectively. Our coda magnitude estimates are linearly correlated with catalog magnitudes, and our observed lateral variations in coda‐ <fi>Q</fi> <sub> <fi>C</fi> </sub> and our site amplification factors are in general agreement with previous results, although there are notable differences at some locations. This approach provides a unified, accurate, and stable method to measure coda‐ </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><abstract type =“main”xml：lang =“en”XML：ID =“JGRB53178-ABS-ABS-ABS-0001”> <标题类型=“main”>抽象</ title> >地震CODA波可用于约束衰减，估计地震幅度和确定现场扩增因子。我们开发了一种新的多语言和多因素方法，可以同时确定这三个重要的地震参数。我们分析642个代表当地（≤100公里）和浅（≤20km）地震，目录大幅度为1.8％和5.4，在南加利福尼亚州，以1.5,3,6和12 Hz为中心的多个频段。我们发现移动平均时间窗口的长度可以影响Coda衰减的测量<fi> q </ fi> <sub> <fi> c </ fi> </ sub>，但我们的测试表明最佳窗口长度约为主导数据周期的15倍。我们使用线性回归来适合每个CODA部分，仅使用具有大于0.9的相关系数的模型衰减率同意的那些部分。对于频率相关的Coda- <Fi> Q </ Fi> <sub> <fi> c </ fi> </ sub>型号（<fi> q </ fi> <sub> <fi> c </ fi > </ sub> = <fi> q </ fi> <sub> 0 </ sub> <fi> <fi> <fi> n </ fi> </ fi> <fi> n </ fi> </ sup>）参考频率，我们的结果分别为107-288和0.42-1.4的<fi> q </ fi> <sub> 0 </ sub>和<fi> n </ fi>的估计。我们的CoDa幅度估计与目录大小线性相关，并且我们观察到Coda- <Fi> Q </ Fi> <sub> <fi> c </ fi> </ sub>以及我们的站点放大因子的横向变化与以前的结果同意，尽管某些地方有明显的差异。这种方法提供了统一，准确，稳定的方法来测量CODA- </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-34677/'>《Journal of geophysical research. Solid earth: JGR》</a> <b style="margin: 0 2px;">|</b><span>2019年第1期</span><b style="margin: 0 2px;">|</b><span>共21页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wang W.&option=202" target="_blank" rel="nofollow">Wang W.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Shearer P. M.&option=202" target="_blank" rel="nofollow">Shearer P. M.;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Institute of Geophysics and Planetary Physics Scripps Institution of OceanographyUniversity of California San DiegoLa Jolla CA USA;</p> <p>Institute of Geophysics and Planetary Physics Scripps Institution of OceanographyUniversity of California San DiegoLa Jolla CA USA;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/163.html" title="地球物理学">地球物理学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> </p> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704025591020.html">An Improved Method to Determine Coda‐ <fi >Q</fi>Q , Earthquake Magnitude, and Site Amplification: Theory and Application to Southern California</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wang W.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Wang W.,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Shearer P. 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An Improved Method to Determine Coda‐ QQ , Earthquake Magnitude, and Site Amplification: Theory and Application to Southern California

摘要