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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=57" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">美地震预警系统成功报警 </h1> <p class="xg1"> 时间：2013-3-15 16:08<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1800)</em> 评论: 0</p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=57" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>11日，南加州发生4．7级有感地震前，最快到达的P波触发这一系统。随后，位于加州理工学院的电脑发出警报，提示后续地震波即将到达加州理工学院所在地帕萨迪纳市的时间和震级等情况。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content">美国地震学家凯特·哈顿14日接受新华社记者采访时说，加利福尼亚州正在<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>的地震预警系统11日在南加州发生地震前30秒成功发出警报。据哈顿介绍，这一地震预警系统通过设置在各地的感应器，将破坏力较小但速度较快的P波信息传递到与之相连的电脑，进而对地震位置、震级、时间等进行预测和报警。 <BR><BR>11日，南加州发生4．7级有感地震前，最快到达的P波触发这一系统。随后，位于加州理工学院的电脑发出警报，提示后续地震波即将到达加州理工学院所在地帕萨迪纳市的时间和震级等情况。<BR><BR>这一预警系统由加州理工学院和加州大学伯克利分校等科研机构研发，目前正在试验运行。科研人员希望该系统此次对5级以下地震的成功预警能吸引更多资金投入，用于升级、添置监测站和感应器。<BR><BR>提前十几秒至几十秒发出有效地震预警，可使疾速行驶的列车减速停车，燃气和电力公司采取应急保护措施，危险设施及时关闭，人员撤离到安全地带。<BR><BR>P波是一种纵波，能在固体、液体或气体中传递。在所有地震波中，P波前进速度最快，也最早抵达地表，随后来袭的是具有毁灭作用的S波。但是，距离震中越近的地区，预警时间越短，因为这两种地震波会接踵而至。 <DIV><FONT color="#808080" size=2><IMG src="http://www.oecr.com/xwb/images/bgimg/icon_logo.png"> 已同步至 <a 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