专家解读：唐山5.1级地震地震属1976年地震余震
<p>7月12日6时38分，河北省唐山市古冶区发生5.1级地震，河北省人民政府已启动三级应急响应。</p><p>7月12日，消防救援人员在河北省唐山市古冶区卑家店镇前巍峰山村村民家中排查。应急管理部表示，此次地震震源深度10千米，震中古冶区位于北京市东南部170公里、天津市西北处约130公里处。唐山市宣传部门表示，截至7月12日晚，没有接到人员伤亡及严重损失报告。</p><p>【知识点】</p><p>地震的强度</p><p>该地震造成河北唐山市中心震感强烈，天津、河北承德震感明显，北京、河北廊坊、沧州等地有震感中国地震台网中心副主任、研究员刘杰表示，</p><p><span word="The">The</span> 5.1 <span word="magnitude">magnitude</span> <span word="quake">quake</span> <span word="on">on</span> <span word="Sunday">Sunday</span> <span word="was">was</span> <span word="an">an</span> <span word="aftershock">aftershock</span> <span word="of">of</span> <span word="the">the</span> 1976 <span word="one">one</span>, <span word="and">and</span> <span word="another">another</span> <span word="quake">quake</span> <span word="of">of</span> <span word="more">more</span> <span word="than">than</span> 5 <span word="magnitude">magnitude</span> <span word="was">was</span> <span word="unlikely">unlikely</span> <span word="to">to</span> <span word="occur">occur</span> <span word="in">in</span> <span word="the">the</span> <span word="area">area</span> <span word="in">in</span> <span word="the">the</span> <span word="short">short</span> <span word="term">term</span>.</p><p>唐山本次地震属1976年地震余震，短期内老震区再次发生5级以上地震的可能不大。</p><p><span word="He">He</span> <span word="said">said</span> <span word="the">the</span> <span word="epicenter">epicenter</span> <span word="of">of</span> <span word="Sunday">Sunday</span>'<span word="s">s</span> <span word="quake">quake</span> <span word="was">was</span> 28 <span word="km">km</span> <span word="from">from</span> <span word="the">the</span> <span word="epicenter">epicenter</span> <span word="of">of</span> <span word="the">the</span> 1976 <span word="quake">quake</span>, <span word="well">well</span> <span word="within">within</span> <span word="the">the</span> <span word="aftershock">aftershock</span> <span word="zone">zone</span>, <span word="and">and</span> <span word="was">was</span> <span word="considered">considered</span> <span word="a">a</span> <span word="normal">normal</span> <span word="fluctuation">fluctuation</span>.</p><p>这次5.1级地震的震中距离唐山1976年主震约28千米，位于其余震区内，是正常的地震起伏活动。</p><p><span word="The">The</span> <span word="energy">energy</span> <span word="accumulation">accumulation</span> <span word="of">of</span> <span word="Tangshan">Tangshan</span>'<span word="s">s</span> <span word="earthquake">earthquake</span> <span word="in">in</span> 1976 <span word="took">took</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="years">years</span>, <span word="so">so</span> <span word="it">it</span>'<span word="s">s</span> <span word="a">a</span> <span word="normal">normal</span> <span word="phenomenon">phenomenon</span> <span word="that">that</span> <span word="the">the</span> <span word="aftershocks">aftershocks</span> <span word="of">of</span> <span word="the">the</span> <span word="quake">quake</span> <span word="can">can</span> <span word="last">last</span> <span word="for">for</span> <span word="dozens">dozens</span> <span word="of">of</span> <span word="years">years</span>. <span word="The">The</span> <span word="frequency">frequency</span> <span word="and">and</span> <span word="magnitude">magnitude</span> <span word="of">of</span> <span word="aftershocks">aftershocks</span> <span word="of">of</span> <span word="earthquakes">earthquakes</span> <span word="will">will</span> <span word="decrease">decrease</span> <span word="with">with</span> <span word="time">time</span>.</p>
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