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NASA Tests GPS Monitoring System for Big U.S. Quakes

By Guest PostApril 25, 2012Environment2004 sumatra quake, california, craig dobson, earthquake, frank webb, geoffrey blewitt, gps, gps data, hazard monitoring, la jolla, location, magnitude, NASA, natural hazard, oregon, pacific, readi, reno, ring of fire, seismological instrument, space based technology, timothy melbourne, tsunami warning, university of nevada, usgs, Washington, western united states, yehuda bock

PASADENA, Calif. – The space-based technology that lets GPS-equipped motorists constantly update their precise location will undergo a major test of its ability to rapidly pinpoint the location and magnitude of strong earthquakes across the western United States. Results from the new Real-time Earthquake Analysis for Disaster (READI) Mitigation Network soon could be used to assist prompt disaster response and more accurate tsunami warnings.

The new research network builds on decades of technology development supported by the National Science Foundation, the Department of Defense, NASA and the U.S. Geological Survey (USGS). The network uses real-time GPS measurements from nearly 500 stations throughout California, Oregon and Washington. When a large earthquake is detected, GPS data are used to automatically calculate its vital characteristics, including location, magnitude and details about the fault rupture. (more…)

One Year after Triple Disasters, Japan Continues to Struggle

By Guest PostMarch 3, 2012Environment, Generalbureaucratic red tape, catastrophe, coastal city, coastal communities, earthquake, ethan segal, evacuation zone, fukushima nuclear power plant, haiti, hurricane katrina, Japan, japanese government, japanese history, katsurao, michigan state university, nuclear meltdown, rikuzen takata, tepco, tokyo electric power, triple disasters, tsunami

EAST LANSING, Mich. — A year after Japan was struck by triple disasters – earthquake, tsunami and nuclear meltdown – many citizens cannot find regular work and face the possibility of never returning to their homes and seeing their communities disappear, according to a Michigan State University scholar.

Ethan Segal, associate professor of Japanese history, made two trips to Japan following the March 11, 2011, catastrophe, spending close to two weeks in the northeastern part of the country that was most directly affected. (more…)

Protecting People From Deadly Floods, Quakes in The Philippines

By Guest PostFebruary 25, 2012Environment, Generaldisaster, earthquake, economic vulnerability, elizabeth renckens, flash flooding, flood zones, flooding, gavin shatkin, geological features, greater metropolitan manila, manila, marikina river, mudslides, natural, philippine, southeast asian, topography, typhoons, university of michigan, urban planning, william foreman

ANN ARBOR, Mich.— Typhoons thrash the Philippines every year, causing flash flooding and mudslides that often kill hundreds of people in the Southeast Asian nation. Many blame the death and destruction on the wrath of nature. But Gavin Shatkin has a different view.

“Disasters are not natural,” said Shatkin, an associate professor of urban planning at the University of Michigan. “They happen because of social structures.” (more…)

Japan Earthquake Appears to Increase Quake Risk Elsewhere in the Country

By Guest PostMay 26, 2011Environmentaftershocks, boso, coulomb stress triggering, earthquake, geological evidence, honshu island, izu islands, Japan, japan sea, jian lin, kyoto university, magnitude, mainshocks, microearthquakes, mount, nagano, normal faults, ross s stein, sanriku hokobu, sendai, stress, toda, tohoku earthquake, tohoku mainshock, tokyo area, tsunami, usgs, whoi, woods hole oceanographic institution

Japan’s recent magnitude 9.0 earthquake, which triggered a devastating tsunami, relieved stress along part of the quake fault but also has contributed to the build up of stress in other areas, putting some of the country at risk for up to years of sizeable aftershocks and perhaps new main shocks, scientists say.

After studying data from Japan’s extensive seismic network, researchers from the Woods Hole Oceanographic Institution (WHOI), Kyoto University and the U.S. Geological Survey (USGS) have identified several areas at risk from the quake, Japan’s largest ever, which already has triggered a large number of aftershocks. (more…)

NASA Shows Topography of Tsunami-Damaged Japan City

By Guest PostMarch 13, 2011Environmentcoastal plain, earthquake, Japan, miyagi prefecture, NASA, national geospatial intelligence agency, nga, ohu mountains, pacific ocean, radar image, sendai, shuttle radar topography mission, srtm, subduction plate boundary, topography, tsunami, u s geological survey

The topography surrounding Sendai, Japan is clearly visible in this combined radar image and topographic view generated with data from NASA’s Shuttle Radar Topography Mission (SRTM) acquired in 2000. On March 11, 2011, a magnitude 8.9 earthquake struck offshore about 130 kilometers (80 miles) east of Sendai, the capital city of Japan’s Miyagi Prefecture, generating a tsunami that devastated the low-lying coastal city of about 1 million residents.

The city is centered in the image and lies along the coastal plain between the Ohu Mountains and the Pacific Ocean. The eastern part of the city is a low-lying plains area, while the city center is hilly (the city’s official elevation is about 43 meters, or 141 feet). Sendai’s western areas are mountainous, with its highest point being Mt. Funagata at an elevation of about 1,500 meters (4,921 feet) above sea level. (more…)

Tsunami Waves Crash Into Japan’s North-east After Powerful Quake

By PravdaMarch 11, 2011Environment, Generalcoastal parts, earthquake, epicenter, friday, fukushima prefecture, highways, iwate prefecture, Japan, magnitude of the earthquake, mariana islands, miyagi, north east, onahama city, plumes of smoke, quake, richter scale, tokyo, tsunami warning, tsunami wave

The government of Japan has provided a report about the damage caused by a strong earthquake which rocked the north-east of the country on Friday, March 11. The Associated Press reports with reference to Japanese television that the tsunami wave, triggered by the quake, caused significant destruction in the northern part of the country.

The magnitude of the earthquake, which took place in Japan on Friday, was measured 8.8 on Richter scale. Quakes still continue in the capital, Tokyo. The epicenter of the quake was located 382 kilometers to the north-east off Tokyo, at the depth of 10 kilometers. (more…)

Haiti Quake Risk May Still be High

By Guest PostNovember 1, 2010Environment, Sciencecalifornia, carol prentice, earthquake, enriquillo plantain garden fault, epg fault, fault, geology, haiti, haiti earthquake, january, loma prieta quake, paleoseismology, ruptures, san andreas fault, seismic hazard, strain, U.S. Geological Survey

The fault initially thought to have triggered January’s devastating earthquake in Haiti is likely still under considerable strain and continues to pose a significant seismic hazard, according to a study published online in Nature Geoscience Sunday.

U.S. Geological Survey geologist Carol Prentice led a team of scientists to Haiti immediately after the earthquake to search for traces of ground rupture and to investigate the geology and paleoseismology of the area. (more…)

Mysteries of Unpredictable Tsunami Waves

By PravdaOctober 30, 20101 commentScienceanton evseev, atmospheric pressure, balearic islands, betu monga, earthquake, epicenter, indonesia, krakatoa, kuril islands, mentawai archipelago, mentawai islands, new guinea tsunami, ocean, offshore quakes, pacific ocean, predictions, rissaga, seismic gaps, seismologist, sergey fedotov, south island pagai, tsunami, tsunami warning center, tsunami waves

One of the most terrible consequences of offshore quakes is giant tsunami waves, sweeping everything on their way. Until now, scientists cannot answer a simple question: why in some cases they happen, and in others they do not? If it was established, then a tragedy like the one that has recently occurred in Indonesia could have been avoided.

An earthquake measuring 7.5 points, which occurred late on Monday, October 25 in Indonesia, caused a tsunami, which affected Mentawai islands in the western part of the country. Interestingly, the epicenter of the aftershocks of this earthquake was located 78 km west of the South Island Pagai of the Mentawai archipelago, at a depth of 20 km below the bottom of the Pacific Ocean. Apparently, this is why the first few minutes after the earthquake the Indonesian government reported the tsunami threat, but later canceled the alert. (more…)

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