What caused the M 8.3 earthquake in Chile on September 16, 2015?

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In summary, an 8.3 magnitude earthquake rocked Chile's capital Santiago, causing buildings to sway and people to take refuge in the streets. Several strong aftershocks hit within minutes as tsunami alarms sounded in the nearby port of Valparaiso. The Chilean emergency office warned that big waves caused by the quake could hit the coast by 11 p.m (local time). Coastlines along parts of Chile, French Polynesia, Mexico, Ecuador, Peru, Antartica, California, New Zealand, Marshall Islands, Fiji
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davenn
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my seismogram ... the surface waves are max'ing out the sensor

150916 2254UT M8.3 Chile zhi.gif
 
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http://www.nzherald.co.nz/world/news/article.cfm?c_id=2&objectid=11514540

A powerful magnitude-8.3 earthquake shook Chile's capital Santiago, causing buildings to sway and people to take refuge in the streets. Several strong aftershocks hit within minutes as tsunami alarms sounded in the nearby port of Valparaiso.

Chilean authorities issued a tsunami alert for the country's entire coast, and U.S. officials posted an alert for Hawaii. Chile's emergency office warned that big waves caused by the quake could hit the coast by 11 p.m (local time).

Here in NZ:
The Ministry of Civil Defence has issued a tsunami warning for East Cape, Chatham Islands, Coromandel and Banks Peninsula.
 
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http://earthquake.usgs.gov/earthquakes/eventpage/us20003k7a#general_summary
http://earthquake.usgs.gov/earthquakes/eventpage/us20003k7a#scientific_finitefault:us_us20003k7a

http://ptwc.weather.gov/text.php?id=pacific.TSUPAC.2015.09.17.0225
Code:
TSUNAMI THREAT FORECAST
-----------------------

  * TSUNAMI WAVES REACHING MORE THAN 3 METERS ABOVE THE TIDE
    LEVEL ARE POSSIBLE ALONG SOME COASTS OF:

        CHILE.

  * TSUNAMI WAVES REACHING 1 TO 3 METERS ABOVE THE TIDE LEVEL ARE POSSIBLE ALONG SOME COASTS OF: 

       FRENCH POLYNESIA.

  * TSUNAMI WAVES REACHING 0.3 TO 1 METERS ABOVE THE TIDE LEVEL ARE POSSIBLE FOR SOME COASTS OF:

      MEXICO... ECUADOR... PERU... ANTARCTICA... JAPAN... NEW
      CALEDONIA... NEW ZEALAND... MARSHALL ISLANDS... FIJI... SAMOA...
      AMERICAN SAMOA... COOK ISLANDS... TOKELAU... VANUATU...
      KIRIBATI... JOHNSTON ISLAND... PALMYRA ISLAND... HOWLAND AND
      BAKER... TONGA... WALLIS AND FUTUNA... PITCAIRN ISLANDS...
      NIUE... SOLOMON ISLANDS... RUSSIA... HAWAII... AND NW HAWAIIAN ISLANDS.

  * TSUNAMI WAVES ARE FORECAST TO BE LESS THAN 0.3 METERS ABOVE
    THE TIDE LEVEL FOR THE COASTS OF
 
      EL SALVADOR... GUATEMALA... HONDURAS... COSTA RICA...
      NICARAGUA... PANAMA... COLOMBIA... AUSTRALIA... PHILIPPINES...
      TAIWAN... CHINA... NORTHERN MARIANAS... GUAM... PALAU... YAP...
      POHNPEI... CHUUK... KOSRAE... NAURU... WAKE ISLAND... MIDWAY
      ISLAND... JARVIS ISLAND... TUVALU... PAPUA NEW GUINEA...
      INDONESIA... VIETNAM... MALAYSIA... AND BRUNEI.[/SIZE]
 
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here's the processed seismogram from my sensor ...

150916.230202.zhi.gif
 

Related to What caused the M 8.3 earthquake in Chile on September 16, 2015?

1. What is a Major M 8.3 quake?

A Major M 8.3 quake refers to a powerful earthquake with a magnitude of 8.3 on the Richter scale, which is used to measure the strength of earthquakes. This type of quake is considered to be very strong and can cause significant damage and destruction.

2. Where is the current M 8.3 quake occurring?

The current M 8.3 quake is occurring in Chile, specifically in the coastal region of Coquimbo. It has been reported to have originated from a depth of 25 kilometers below the surface.

3. How severe is the impact of a M 8.3 quake?

The impact of a M 8.3 quake can vary depending on several factors such as the location of the epicenter, depth of the quake, and the strength of the underlying infrastructure. However, generally, this type of quake can cause extensive damage to buildings, roads, and other structures, as well as trigger landslides and tsunamis.

4. Is there a possibility of aftershocks following a M 8.3 quake?

Yes, there is a high possibility of aftershocks following a M 8.3 quake. Aftershocks are smaller earthquakes that occur after the initial quake and can continue for days, weeks, or even months after the main event. It is important to remain cautious and prepared for potential aftershocks after a major quake.

5. What should I do if I am in an area affected by a M 8.3 quake?

If you are in an area affected by a M 8.3 quake, it is important to follow the instructions of local authorities, stay away from damaged buildings and structures, and be prepared for potential aftershocks. If you are in a coastal region, be aware of the risk of tsunamis and follow evacuation orders if necessary. It is also important to have a plan in place for any natural disasters and to stay informed through reliable sources of information.

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