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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。






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