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Posts Tagged ‘Argentina quake’

Chile Earthquake and Tsunami Update 1 (28 Feb)

Posted by feww on February 28, 2010

Death Toll reaches 309 and Rising

8.8 Megaquake destroys houses, buildings, hospitals, bridges, roads and other structures

The Chile M8.8 quake released about 180 times more energy than the recent Haiti quake (estimated at 7.3Mw). Up to 70 medium to powerful aftershocks measuring M5.0 to M7.0 have been reported by USGS and other EQ monitoring centers

Chilean government has declared 6 regions as “zones of catastrophe,” but has made no formal request for international aid as yet.

Power and telephone lines are down throughout most of Chile making the flow of information extremely difficult [Other countries are advised to revise their communication systems]

  • Water lines are cut off in most parts of the country.
  • Many deaths are reported in Maule near the epicenter, as well as in the regions of  Araucania,  Biobio,  O’Higgins,  Santiago and Valparaiso, some of the places where powerful aftershocks occurred.
  • In Santiago, capital of Chile, at least a dozen large building have collapse killing more than 15 people (the death toll could rise).
  • About 200 people were caught inside an apartment block which collapsed  in the major city of Concepcion, the closest to the epicenter, and officials said they had no idea if anyone escaped, according to news reports.
  • A chemical plant near Santiago has caught fire forcing the authorities to evacuate several thousand people from the neighborhood.
  • Santiago International airport has been damaged and will be closed for at least a week.


Freeze frame from a local TV report shows  a building in Concepcion that caught fire as a result of the earthquake.

The international airport in Santiago, the Chilean capital, located about 320km (200 miles) north of the epicenter, was  closed as the megaquake caused damage to some roads and building facades.

A strong M6.3 aftershock in Salta, Argentina killed at least 2 people last night, officials said.


Rescue workers search for victims and survivors after an apartment complex collapsed during an earthquake in Concepcion some 100 km (62 miles) south of the epicenter, February 27, 2010.  Credit: REUTERS/Jose Luis Saavedra. Image may be subject to copyright. For more image images, click links in the Related Images section below.

The megaquake was the fifth-largest seismic event since 1900.   Chile was also the scene of the largest earthquake in the world  which measured 9.5Mw, which killed  1,655 people and injure 3,000 others, leaving about 2,000,000 homeless.

The tsunami generated by the 1960 quake  caused 61 deaths and $75 million damage in Hawaii [most of the damage occurred at Hilo, with the runup height reaching 10.6 m.] Several hundred other people in Japan and the Philippines were also killed or reported missing as a result of the destructive tsunami.


Collapsed highway Near Santiago.  Vehicles driving along a highway that collapsed during the megaquake were thrown on the road below on Saturday. Photo Credit:  Associated Press. Image may be subject to copyright. See FEWW Fair Use Notie.

Tsunami

Japan is bracing for a possible tsunami wave of 3m (10ft) or higher that could strike the Pacific coast of Hokkaido at about 13:00JST  (04:00 UTC).


Japan Meteorological Agency (JMA)Tsunami Forecast Map.  Image may be subject to copyright.

  • Major Tsunami is marked in RED: Tsunami height is expected to be 3 meters or higher.
  • Tsunami is marked in YELLOW: Tsunami height is expected to be up to 2 meters.
  • Tsunami Advisory: Tsunami height is expected to be about 0.5 meters.

Japanese government has ordered thousands of residents on coastal areas to evacuate to higher grounds.

A tsunami generated by the megaquake overwhelmed the port of Talcahuano, a major port in southern Chile, causing substantial damage to the harbor and the boats, and flooding streets.

A huge wave swept the Juan Fernandez islands, President Michelle Bachelet was reported as saying. The wave reportedly 7, with at least a dozen more islanders reported missing, according to a local officials.

Hawaii recorded tsunami surges of up to 12 inches about half an hour later than oceanographers had forecast, according to an official with the Hawaii County Civil Defense. Some officials had predicted that the waves would be as high as 4.8m (14 feet) despite the freely available tsunami ADVISORY reports.

In French Polynesia, a 1.8m (6 ft ) high wave swept ashore. As of posting,  there was no reports of casualties or damage. However,  casualties and damage will most probably occur.

A 1.7m was observed at Valparaiso, west of Santiago, and reports of more damage are expected.

In Australia, a tsunami wave measuring 50cm (1.6 feet) was reported off Norfolk Island, about 1,600 kilometers (1,000 miles ) northeast of Sydney.

On Chatham Islands, NZ officials reported a 2-meter high wave striking the coast. About a thousand people in the coastal cities of Gisborne and Napier in the  North Island were reportedly evacuated from low-lying areas.

In Tonga, there were reports of a 2.2-meter (6.6 feet) high wave sweeping an unnamed small northern island, an official said.

In the Philippines the officials said they were expecting a 1-meter high wave later this afternoon local time.

Socioeconomic Aftershocks

President Michelle Bachelet has said that two million Chileans have been affected by the Saturday’s Megaquake. Her estimate is realistic.

Thousands of people in Argentina may have also been affected.

10-degree Map Centered at 35°S,75°W (USGS)


Latest EQ Location map.
Source: USGS/EHP. Enhanced by FEWW

Fire-Earth Moderators believe that the geophysical prognosis doesn’t bode well for Chile, and a number of other countries, especially those  on the PRF,  for at least the next 3  years.

On January 2, Fire-Earth forecast 2010 Likely the Most Disastrous Year on Record. See also 2010 Disaster Calender- Year One of Human-Enhanced Disasters.

Related Links:

Related Images:

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Chile 8.8 Megaquake Strikes Offshore Maule

Posted by feww on February 27, 2010

Large Earthquake Measuring 8.8Mw Strike Off the Coast of Central Chile

The Chilean Megaquake with nearly 1 exajoule of energy (about 240 megaton, or 16,000 times the size of Hiroshima A-bomb) has caused much destruction

The massive quake struck about 100 km (60 miles) NNW of Chillan, Chile, at a depth of about 35km on February 27, 2010 at 06:34:14 UTC, USGS/EHP reported.

The mainshock was followed by at least 11 medium to powerful aftershocks, as of posting, the largest of which was a magnitude 7.0 shock.

Fatalities/Damage:

According to a local report at least 50 people have been killed, but more deaths are highly probable as the mega earthquake unleashed massive energy. Many buildings have been destroyed. The power lines are  down and communication links between the epicenter and Chilean capital Santiago are affected.

Tsunami Warning:

The Pacific Tsunami Warning Center has issued a tsunami warning for Chile and Peru, and a tsunami watch for Ecuador, Colombia, Panama and Costa Rica.

10-degree Map Centered at 35°S,75°W


Earthquake location Map. Source: USGS/EHP. Enhanced by FEWW

Earthquake Details

  • Magnitude: 8.8
  • Date-Time:
    • Saturday, February 27, 2010 at 06:34:14 UTC
    • Saturday, February 27, 2010 at 03:34:14 AM at epicenter
  • Location: 35.846°S, 72.719°W
  • Depth: 35 km (21.7 miles)
  • Region: OFFSHORE MAULE, CHILE
  • Distances:
    • 100 km (60 miles) NNW of Chillan, Chile
    • 105 km (65 miles) WSW of Talca, Chile
    • 115 km (70 miles) NNE of Concepcion, Chile
    • 325 km (200 miles) SW of SANTIAGO, Chile
  • Location Uncertainty: horizontal +/- 7.2 km (4.5 miles)
  • Source: USGS NEIC (WDCS-D)
  • Event ID:  us2010tfan

Political Map of Chile. Click to enlarge.

Tectonic Summary

This earthquake occurred at the boundary between the Nazca and South American tectonic plates. The two plates are converging at a rate of 80 mm per year. The earthquake occurred as thrust-faulting on the interface between the two plates, with the Nazca plate moving down and landward below the South American plate. Coastal Chile has a history of very large earthquakes. Since 1973, there have been 13 events of magnitude 7.0 or greater. The February 27 shock originated about 230 km north of the source region of the magnitude 9.5 earthquake of May, 1960 – the largest instrumentally recorded earthquake in the world. This great earthquake killed 1,655 people in southern Chile and unleashed a tsunami that crossed the Pacific, killing 61 people in Hawaii, Japan, and the Philippines. Approximately 870 km to the north of the February 27 earthquake is the source region of the magnitude 8.5 earthquake of November, 1922. This great quake significantly impacted central Chile, killing several hundred people and causing severe property damage. The 1922 quake generated a 9-meter local tsunami that inundated the Chile coast near the town of Coquimbo; the tsunami also crossed the Pacific, washing away boats in Hilo harbor, Hawaii. The magnitude 8.8 earthquake of February 27, 2010 ruptured the portion of the South American subduction zone separating these two massive historical earthquakes. A large vigorous aftershock sequence can be expected from this earthquake. (Source: USGS)

10-degree Map Centered at 35°S,75°W – UPDATE

Earthquake location Map. Source: USGS/EHP. Enhanced by FEWW

Historic Seismicity (USGS/EHP)

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Seismic Hazard Map

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Population Exposure Maps (USGS)


USGS Population Exposure MAP. Click image to enlarge. Click here for PDF version.


USGS Population ShakeMAP. Click image to enlarge.

Other Events:

Meanwhile, GFZ Potsdam – Earthquake Bulletin reported a magnitude 5.8 earthquake in San Juan Province, Argentina, about 600 km NNE of the Chile quake:

Region: San Juan Province, Argentina
Time: 2010-02-27 06:51:19.4 UTC
Magnitude: 5.8
Epicenter: 68.82°W 31.46°S
Depth: 64 km
Status: manually revised

Fire-Earth Earthquake Forecast:  Up to 4 more megaquakes could occur globally in 2010 with probabilities of 0.8 (78%) descending to 0.5 (48%).

[Note: The frequency of occurrence of earthquakes measuring 8.0 Mw or greater is about 1 event per year.]

Related Links:

Posted in chile earthquake, Concepción, earthquake, earthquake forecast, SANTIAGO quake, Talca quake | Tagged: , , , , , , | 9 Comments »