Near‐Real‐Time Estimates on Earthquake Rupture Directivity Using Near‐Field Ground Motion Data From a Dense Low‐Cost Seismic Network

Jan Jyh Cherng; Huang Hsin‐Hua; Wu Yih‐Min; Chen Chien‐Chih; Lin Cheng‐Horng

摘要

Abstract > Rupture directivity of earthquakes could amplify ground shaking and cause serious earthquake hazards. Its timely information is therefore of great importance for early shaking alerts and emergency responses. To this end, we test the feasibility of using near‐field (<25?km) ground motion data from a dense low‐cost seismic network in Taiwan to constrain directivity information and provide warning for far‐field areas. The method is simple and robust, based on the real‐time shaking map interpolation and directional attenuation regression analysis. Applications to 16 moderate‐ to large‐magnitude earthquakes in Taiwan and California show that the directivity can be stably obtained within 17?s and agrees well with previous studies when available. An indicator of the strength of directivity amplification is also defined and reveals a prevalence of strong directivity effect for M <sub> L </sub> ?≥?6.0 earthquakes in Taiwan. Such near‐real‐time directivity information can therefore be useful in earthquake early warning systems for providing more accurate ground shaking alerts. </abstract> </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”> <标题类型=“main”>摘要</标题> >地震的破裂方向性可以放大地面摇动并引起严重地震危害。因此，其及时的信息对于早期摇动警报和紧急响应非常重要。为此，我们测试在台湾密集的低成本地震网络中使用近场（<25 km）地面运动数据的可行性，以限制方向性信息，并为远场区域提供警告。该方法是简单且坚固的，基于实时摇动地图插值和定向衰减回归分析。在台湾和加利福尼亚州的16个中等地震中的应用表明，可稳定在17？S中可以稳定地获得的方向性，并在可用时与先前的研究一致。还定义了方向性扩增强度的指标，并揭示了对台湾的强度效应的强度效应的普遍性，≥6.0地震。因此，这种近实时方向性信息可以在地震预警系统中有用，以提供更准确的地面摇动警报。 </ p> </ abstract> </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-23539/'>《Geophysical Research Letters》</a> <b style="margin: 0 2px;">|</b><span>2018年第15期</span><b style="margin: 0 2px;">|</b><span>共8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=Jan Jyh Cherng&option=202" target="_blank" rel="nofollow">Jan Jyh Cherng;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Huang Hsin‐Hua&option=202" target="_blank" rel="nofollow">Huang Hsin‐Hua;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wu Yih‐Min&option=202" target="_blank" rel="nofollow">Wu Yih‐Min;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Chen Chien‐Chih&option=202" target="_blank" rel="nofollow">Chen Chien‐Chih;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Lin Cheng‐Horng&option=202" target="_blank" rel="nofollow">Lin Cheng‐Horng;</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>Department of Earth SciencesNational Central UniversityJhongli Taiwan;</p> <p>Institute of Earth SciencesAcademia SinicaTaipei Taiwan;</p> <p>Institute of Earth SciencesAcademia SinicaTaipei Taiwan;</p> <p>Department of Earth SciencesNational Central UniversityJhongli Taiwan;</p> <p>Institute of Earth SciencesAcademia SinicaTaipei Taiwan;</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;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=rupture directivity&option=203" rel="nofollow">rupture directivity;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=peak ground motions&option=203" rel="nofollow">peak ground motions;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=near‐real‐time determination&option=203" rel="nofollow">near‐real‐time determination;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=low‐cost seismic network&option=203" rel="nofollow">low‐cost seismic network;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=finite source effect&option=203" rel="nofollow">finite source effect;</a> </p> <div class="translation"> 机译：破裂方向性;峰地运动;近实时确定;低成本地震网络;有限源效应; 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