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广东河源市震源0公里地震或由溶洞塌陷导致

2016-10-29 22:16:45   新华网

记者调查:广东河源市震源“0千米”的3级地震是怎么发生的?

新华社广州10月29日新媒体专电 题:记者调查:广东河源市震源“0千米”的3级地震是怎么发生的?

新华社记者田建川

据中国地震台网测定,28日15时55分在广东河源市连平县发生3.0级地震,震源深度0千米。震源深度“0千米”的地震并不多见,此次地震是怎么发生的,它跟公众熟知的构造地震有什么区别?记者赶赴现场进行了调查。

  地震持续10余秒 记者目睹山体滑落

中国地震台网测定的此次震中位置是“北纬24.14度,东经114.62度”。根据广东省地震监测中心的监测,震中位于连平县油溪镇泥竹塘铁矿、大顶铁矿区域,震中烈度为Ⅲ度。

广东大顶矿业股份有限公司厂区的一名保安说,“地震”发生时,他正在保安室值班,有明显震感,持续了十几秒钟。“矿区经常有爆破作业,也会有震感,但这次感觉更加强烈。”

隔壁县东源县涧头镇的坚基矿业有限公司距离震中位置约1.8千米。记者29日在该公司矿区周边看到,一个废弃的采矿深坑四周有明显的山体滑坡痕迹。东源县坚基矿业有限公司矿长助理邓占元说,29日上午公司排查时发现了该滑坡,滑坡面积约300平方米。

记者现场采访时,小块山体仍有滑落,现场发出“哗哗”的响声,并伴有尘土烟雾。当地国土部门在滑坡外围布置了警戒线。

  已排除采矿爆破导致地震可能性

此次地震是如何引发的?是否是矿区采矿爆破导致?广东大顶矿业股份有限公司副总经理章正华说,该公司一个月大约实施爆破20次左右,每次爆破炸药使用量在5吨左右,爆破时间为每天的17:30分。

“昨天地震发生在下午四点左右,不到我们公司的爆破时间,我们确定没有实施爆破。”章正华说。

邓占元说,由于近两年铁矿石价格低迷,公司几乎处于亏本经营,6个月前已技术性关停了矿区作业,近段时间没有实施过爆破。山体滑坡位置是该矿区8年前已经废弃的露采区采矿边坡。记者在现场看到,现场没有采矿作业的痕迹,被拆除丢弃在矿道通风口外的风机已经明显生锈老旧。

记者从连平县、东源县多个信源了解到,震中位置地处深山区,没有人居住,没有工矿业作业。

河源市地震局局长朱镇强说,“0千米地震”的诱发因素可能包括溶洞塌陷,矿井塌陷、山体滑坡和人工爆破等。目前已经排除人工爆破的可能性。

  地震或由溶洞塌陷或废弃矿洞塌陷导致

广东省地震局29日给记者回复的书面材料表示,根据现场调查报告,没有发现人员伤亡情况,没有爆破事件。初步判定,“此次塌陷地震为溶洞塌陷或废弃矿洞塌陷的可能性较大”。

记者在2012年5月由广东省冶金建筑设计研究院编制的《广东省连平县泥竹塘铁矿项目土地复垦方案报告书》中看到,矿区属构造剥蚀中低山地貌,土壤抗侵蚀能力差,地下水主要储存于构造裂隙和风华裂隙中。

朱镇强说,现场调查后将情况向广东省地震局报告和研究后,从地波分析,此次地震属喀斯特地貌(岩溶地貌)内部发生的现象。邓占元说,“地震中心位于一处断裂带上。”

河源市连平县常务副县长邱亚洪说,该县目前已组织地震、地质、国土等有关部门到现场进一步核实,查清原因。记者了解到,广东省和河源市各有关部门也正继续对此次地震进行调查。(完)

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