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Why there was no tsunami this time
2012-4-12 21:39:56counter(0)  Writer:***   字体:A+ A-

 

  

BANDA ACEH (Indonesia): No deadly waves or serious damage resulted from the two massive earthquakes off Indonesia on Wednesday despite tsunami warnings and instant alerts for evacuation.

Experts said the quakes of magnitude 8.6 and 8.2 did not have the potential to create gigantic waves as the friction between the Earth's tectonic plates occurred horizontally, which does not displace the seabed. This means that the chances of a tsunami were low.

Indonesia's 18,000 islands are prone to temblors because the nation sits along the Pacific Ring of Fire, a zone of active volcanoes and tectonic faults.

In Wednesday's quake, the plates slid against each other, creating more of a vibration in the water and causing waves to rise up to 0.6m in places like Sabang and Meulaboh districts in Aceh. In contrast, mega-thrust quakes, like the one in Japan last year, cause the seabed to rise or drop vertically, displacing massive amounts of water and sending towering waves racing across the ocean at jetliner speeds.

 

北苏门答腊发生8.6级地震 震源深度20公里[2012-04-12]

2012-04-12 11:11:00 来源: 中国广播网(北京) 中广网北京4月11日消息(记者李苑 陈亮)据中国之声《全国新闻联播》报道,据中国地震台网测定,北京时间今天下午4点38分,在苏门答腊北部附近海域发生8.6级地震,震源深度20公里。

据中国地震台网测定,北京时间今天下午4点38分,在苏门答腊北部附近海域,北纬2.3度,东经93.1度,发生8.6级地震,震源深度20公里。

 

目前,印度尼西亚和美国已经发出海啸预警。印尼气象与地球物理局表示,目前还没有收到破坏报告,也没有收到水位上升的报告。美国太平洋海啸预警中心认为,可能的海啸波将在格林尼治时间9点半(北京时间下午5点半)抵达亚齐省首府班达亚齐,地震震中距离海岸有400多公里。

苏门答腊岛是世界第六大岛,印度尼西亚第二大岛。岛上目前有3700万人,每平方公里85人,人口密度并不高。

苏门答腊岛附近一直是地震多发地带,2004年底,由苏门答腊岛引发的印度洋大海啸共导致15.万人死亡。

 
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