Los Angeles - The massive earthquake off Indonesia surprised scientists: Usually this type of jolt isn't this powerful. The biggest earthquakes tend to occur in subduction zones where one plate of the Earth's crust dives under another. This grind produced the 2004 magnitude-9.1 Indian Ocean disaster and the magnitude-9 Japan quake last year
"It's clearly a bit of an odd duck," said seismologist Susan Hough of the US Geological Survey in Pasadena, Calif.
As one of the world's most seismically active places, Indonesia is located on the Pacific "Ring of Fire", an arc of volcanos and fault lines encircling the Pacific Basin. Pressure builds up in the rocks over time and is eventually released in an earthquake.
Wednesday's quake was followed by a magnitude-8.2 aftershock. Both were strike-slip quakes. "A week ago, we wouldn't have thought we could have a strike-slip earthquake of this size. This is very, very large," said Kevin Furlong, a professor of geosciences at Penn State University.
Wednesday's shaker as the 11th largest since 1900.
The Sumatra coast has been rattled by three strong strike-slip quakes since 2004, but Wednesday's was the largest.
Associated Press in Tokyo guardian.co.uk, Sunday 1 April 2012 21.03 BST
Much of Japan's Pacific coast would be inundated by a tsunami more than 34 metres (112 feet) high if an offshore earthquake as powerful as last year's occurred, according to a government panel of experts. They report that a wave of such height could result from any tsunami unleashed by a magnitude-9.0 earthquake in the Nankai trough, which runs east of Japan's main island of Honshu to the southern island of Kyushu. An earlier forecast in 2003 put the potential maximum height of such a tsunami at less than 20 metres (66 feet).
Five people were killed and a child critically injured when a powerful earthquake struck off the coast of northern Indonesia on Wednesday, the country's disaster mitigation agency has said.
At least two people died because of heart attacks, one died because of shock and a child was critically injured when a tree fell, said Sutopo Purwo Nugroho, a spokesman for the agency, who gave no further details.
"Casualties and other damage are still being assessed," he said in a message sent to reporters by text on Thursday.
The 8.6-magnitude earthquake and an 8.2-level aftershock sent panicked residents into the streets in Aceh and was felt as far away as southern India. It was followed by a series of strong aftershocks. But there was no repeat of the tsunami that followed a quake in roughly the same area in 2004. That disaster killed at least 230,000 people in 13 Indian Ocean countries.
NOAA buoy network.. use to see the spread of the wave.. http://www.ndbc.noaa.gov/ A tsunami warning HAS been issued for the surrounding areas... here is the Pacific Tsunami Warning Center website: http://ptwc.weather.gov/ http://ptwc.weather.gov/ptwc/text.php?id=indian.TSUIOX.2012.04.11.0845 00 WEIO21 PHEB 110845 TSUIOX TSUNAMI BULLETIN NUMBER 001 PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS ISSUED AT 0845Z 11 APR 2012 THIS BULLETIN IS FOR ALL AREAS OF THE INDIAN OCEAN. ... AN INDIAN-OCEAN-WIDE TSUNAMI WATCH IS IN EFFECT ... A TSUNAMI WATCH IS IN EFFECT FOR INDONESIA / INDIA / SRI LANKA / AUSTRALIA / MYANMAR / THAILAND / MALDIVES / UNITED KINGDOM / MALAYSIA / MAURITIUS / REUNION / SEYCHELLES / PAKISTAN / SOMALIA / OMAN / MADAGASCAR / IRAN / UAE / YEMEN / COMORES / BANGLADESH / TANZANIA / MOZAMBIQUE / KENYA / CROZET ISLANDS / KERGUELEN ISLANDS / SOUTH AFRICA / SINGAPORE THIS BULLETIN IS ISSUED AS ADVICE TO GOVERNMENT AGENCIES. ONLY NATIONAL AND LOCAL GOVERNMENT AGENCIES HAVE THE AUTHORITY TO MAKE DECISIONS REGARDING THE OFFICIAL STATE OF ALERT IN THEIR AREA AND ANY ACTIONS TO BE TAKEN IN RESPONSE. A very large 8.7 Magnitude earthquake just hit off the coast of Sumatra -- West pacific ... http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc000905e.php use this link below to monitor earthquakes globally: Dozens of sites to use: http://sincedutch.wordpress.com/2011/11/30/11302011-list-of-earthquake-links-for-global-monitoring/ ALWAYS have an earthquake plan ready to go, day or night.. just in case a sizable earthquake hits your area ---- thoughts and prayers go out to anyone effected by this large earthquake.
[USGS] Magnitude 5.1 - OFF THE WEST COAST OF NORTHERN SUMATRA UTC Date-Time: Thursday, April 12, 2012 at 07:43:48 UTC Local Date-Time: Thursday, April 12, 2012 at 01:43:48 PM Location: 2.973°N, 92.742°E Depth: 30.4 km (18.9 miles) Distances: 402 km (250 miles) SW (226°) from Banda Aceh, Sumatra, Indonesia 995 km (618 miles) W (269°) from KUALA LUMPUR, Malaysia...
A tsunami warining was issued in Sri Lanka following the earthquake in Indonesia. The warning evoked painful memories of the 2004 tsunami which divastated the country's coastal area, killing nearly 30,000 people. We were less prepared for the disaster 8 years ago, which was also caused by an undersea earthquake off Indonesia, infact most people had never heard of the word 'tsunami' or what it was like.
Yesterday (11th April) there was pandimonium on the streets as shoppers were buying their last minute goodies for the Sinhalese and Tamil New Year to be celebrated on the 13th and 14th of this month. It was a great relief to everyone when the alert was called off.....phew!! http://www.thesundaily.my/news/346964
A massive earthquake off the coast of Sumatra, Indonesia that was felt as far away as Bangkok and Sri Lanka caused a few tense hours around Indian Ocean counties as a tsunami warning was called. The 8...
Question: Why tsunami tides were not formed in spite of the underwater earthquake of 8.6 magnitude in Indonesia on 11 April 2012?
Answer: I think when the tectonic / seismic plates generate a VERTICAL knock, after the earthquake; massive tides will be generated out of the same. If the knock acts in OTHER-THAN-VERTICAL directions, the resultant tsunami tides would be shorter and weaker.
Harish Jharia Question: Why tsunami tides were not formed in spite of the underwater earthquake of 8.6 magnitude in Indonesia on 11 April 2012? Answer: I think when the tectonic / seismic plates gener...