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Posts Tagged ‘earthquake energy’

M8.2 Aftershock Follows Mega Quake Off Sumatra

Posted by feww on April 11, 2012

Large aftershock strikes Off the Coast of Sumatra

More than a dozen significant aftershocks have occurred off the coast of Sumatra, the largest of which measured 8.2Mw, according to USGS/EHP.


Earthquake Location Map. Source: USGS. Map enhanced by FIRE-EARTH

EQ Details

  • Magnitude 8.2
  • Date-Time:  Wednesday, April 11, 2012 at 10:43:09 UTC
  • Location: 0.773°N, 92.452°E
  • Depth: 16.4 km (10.2 miles)
  • Distances:
    • 618 km (384 miles) SSW of Banda Aceh, Sumatra, Indonesia
    • 712 km (442 miles) W of Sibolga, Sumatra, Indonesia
    • 1,062 km (659 miles) WSW of KUALA LUMPUR, Malaysia
    • 1,773 km (1,101 miles) WNW of JAKARTA, Java, Indonesia
  • Location Uncertainty horizontal +/- 14.2 km (8.8 miles); depth +/- 6.4 km (4.0 miles)
  • Source:  USGS NEIC (WDCS-D)

Tsunami Alert

TSUNAMI BULLETIN NUMBER 005
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 1151Z 11 APR 2012

THIS BULLETIN IS FOR ALL AREAS OF THE INDIAN OCEAN.

... AN INDIAN-OCEAN-WIDE TSUNAMI WATCH IS IN EFFECT ...

... A MAJOR AFTERSHOCK OCCURRED AT 1043Z WITH MAGNITUDE 8.3 ...

... THE WATCH AREA IS NOW REDUCED ...

A TSUNAMI WATCH IS IN EFFECT FOR

 INDONESIA / INDIA / SRI LANKA / MALDIVES / UNITED KINGDOM

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.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

 ORIGIN TIME -  0839Z 11 APR 2012
 COORDINATES -   2.3 NORTH   93.1 EAST
 LOCATION    -  OFF W COAST OF NORTHERN SUMATRA
 MAGNITUDE   -  8.7

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

 GAUGE LOCATION        LAT   LON    TIME        AMPL         PER
 -------------------  ----- ------  -----  ---------------  -----
 TRINCONMALEE LK       8.6N  81.2E  1116Z   0.04M /  0.1FT  18MIN
 COCOS ISLAND AU      12.1S  96.9E  1102Z   0.08M /  0.3FT  18MIN
 TELUKDALAM ID         0.6N  97.8E  1045Z   0.19M /  0.6FT  10MIN
 SABANG ID             5.8N  95.3E  1010Z   0.36M /  1.2FT  06MIN
 MEULABOH ID           4.1N  96.1E  1007Z   1.06M /  3.5FT  12MIN
 DART 23401            8.9N  88.5E  0956Z   0.03M /  0.1FT  06MIN

 LAT  - LATITUDE (N-NORTH, S-SOUTH)
 LON  - LONGITUDE (E-EAST, W-WEST)
 TIME - TIME OF THE MEASUREMENT (Z IS UTC IS GREENWICH TIME)
 AMPL - TSUNAMI AMPLITUDE MEASURED RELATIVE TO NORMAL SEA LEVEL.
        IT IS ...NOT... CREST-TO-TROUGH WAVE HEIGHT.
        VALUES ARE GIVEN IN BOTH METERS(M) AND FEET(FT).
 PER  - PERIOD OF TIME IN MINUTES(MIN) FROM ONE WAVE TO THE NEXT.

 NOTE - DART MEASUREMENTS ARE FROM THE DEEP OCEAN AND THEY
        ARE GENERALLY MUCH SMALLER THAN WOULD BE COASTAL
         MEASUREMENTS AT SIMILAR LOCATIONS.

EVALUATION

 SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. IT MAY
 ALREADY HAVE BEEN DESTRUCTIVE ALONG SOME COASTS.

 BASED ON THESE DATA THE THREAT CONTINUES FOR ALL COASTAL AREAS OF
 THE INDIAN OCEAN. FOR THOSE AREAS - WHEN NO MAJOR WAVES HAVE
 OCCURRED FOR AT LEAST TWO HOURS AFTER THE ESTIMATED ARRIVAL TIME
 OR DAMAGING WAVES HAVE NOT OCCURRED FOR AT LEAST TWO HOURS THEN
 LOCAL AUTHORITIES CAN ASSUME THE THREAT IS PASSED. DANGER TO
 BOATS AND COASTAL STRUCTURES CAN CONTINUE FOR SEVERAL HOURS DUE
 TO RAPID CURRENTS.  AS LOCAL CONDITIONS CAN CAUSE A WIDE
 VARIATION IN TSUNAMI WAVE ACTION THE ALL CLEAR DETERMINATION MUST
 BE MADE BY LOCAL AUTHORITIES.

ESTIMATED INITIAL TSUNAMI WAVE ARRIVAL TIMES AT FORECAST POINTS
WITHIN THE WARNING AND WATCH AREAS ARE GIVEN BELOW. ACTUAL
ARRIVAL TIMES MAY DIFFER AND THE INITIAL WAVE MAY NOT BE THE
LARGEST. A TSUNAMI IS A SERIES OF WAVES AND THE TIME BETWEEN
SUCCESSIVE WAVES CAN BE FIVE MINUTES TO ONE HOUR.

 LOCATION         FORECAST POINT     COORDINATES     ARRIVAL TIME
 --------------------------------    ------------    ------------
 INDONESIA        SIMEULUE            2.5N  96.0E    0912Z 11 APR
                  BANDA_ACEH          5.5N  95.1E    0933Z 11 APR
                  SIBERUT             1.5S  98.7E    0944Z 11 APR
                  PADANG              0.9S 100.1E    1025Z 11 APR
                  BENGKULU            3.9S 102.0E    1037Z 11 APR
                  CILACAP             7.8S 108.9E    1150Z 11 APR
                  BANDAR_LAMPUNG      5.7S 105.3E    1200Z 11 APR
                  BALI                8.7S 115.3E    1234Z 11 APR
                  BELAWAN             3.8N  98.8E    1326Z 11 APR
                  KUPANG             10.0S 123.4E    1333Z 11 APR
                  BALI                8.7S 115.3E    1234Z 11 APR
 INDIA            GREAT_NICOBAR       7.1N  93.6E    0937Z 11 APR
                  LITTLE_ANDAMAN     10.7N  92.3E    1015Z 11 APR
                  NORTH_ANDAMAN      13.3N  92.6E    1045Z 11 APR
                  PORT_BLAIR         11.9N  92.7E    1050Z 11 APR
                  CHENNAI            13.4N  80.4E    1134Z 11 APR
                  TRIVANDRUM          8.3N  76.9E    1204Z 11 APR
                  KAKINADA           17.2N  82.7E    1204Z 11 APR
                  MANGALORE          13.3N  74.4E    1339Z 11 APR
                  BOMBAY             18.8N  72.6E    1605Z 11 APR
                  GULF_OF_KUTCH      22.7N  68.9E    1636Z 11 APR
 SRI LANKA        TRINCOMALEE         8.7N  81.3E    1049Z 11 APR
                  DONDRA_HEAD         5.9N  80.6E    1054Z 11 APR
                  COLOMBO             6.9N  79.8E    1121Z 11 APR
                  JAFFNA              9.9N  80.0E    1235Z 11 APR
 MALDIVES         GAN                 0.6S  73.2E    1144Z 11 APR
                  MALE                4.2N  73.6E    1149Z 11 APR
                  MINICOV             8.3N  73.0E    1214Z 11 APR
 UNITED KINGDOM   DIEGO_GARCIA        7.3S  72.4E    1202Z 11 APR

Related Links

Global Disasters: Links, Forecasts and Background

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Energy Released by Japan Mega Quake

Posted by feww on March 13, 2011

BREAKING NEWS

Japan Meteorological Agency (JMA) has just upgraded the Sendai Megaquake from a Magnitude 8.8 to a 9.0Mw.

Energy released by Japan’s M8.9 M9.0 Mega Quake and its ongoing aftershocks could reach 1.45 a total of 2.02 exajoules (EJ)

The Sendai Megaquake released about 1.41 2.0 EJ of energy (the equivalent of about 340 480 megatons, or 24,000 34,000 Hiroshima bombs).

[NOTE: TNT equivalent is a method of quantifying the energy released in explosions. The megaton is a unit of energy equal to 4.184 petajoules.]

The Aftershocks

As of posting, some 175 significant aftershocks (≥5.0Mw) have been reported since the Megaquake struck.

Moving Honshu to the East

The Megauake moved  Japan’s main island of  Honshu 2.4 m (8 feet) to the east, said a USGS geophysicist.

Geologists at the University of Tokyo say the earthquake shifted the Earth’s axis by about 10cm.

The movement also sped up the Earth’s rotation by about 1.6 microseconds, NASA said.  [Don’t forget to adjust your clocks!!]

The Sinking Land

Some of the stress energy destroyed structures along the eastern coast of Honshu, and split the ground. As a result the land surface in many areas of Miyagi prefecture has sunk by about 70cm (2.2 ft), trapping water brought in buy the deadly tsunami waves.

[A colleague informs us that according to Japan’s Civil Defense manuals people should climb to the third floor of buildings in case of a tsunami. The deadly Sendai Tsunami had reached the fifth floor—about 15 meters high—in many areas!]

The Giant Tsunami

Rest of the energy was used to trigger a giant tsunami. The following image shows the energy map of the Tsunami spawned by the Sendai Megaquake.

Energy Map of Japan’s Tsunami Spawned by the 9.0Mw Megaquake

Source: NOAA. Click image to enlarge.

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Recent Earthquakes ≥ 6.0 Mw

Posted by feww on October 13, 2009

FEWW list of earthquakes measuring ≥ 6.0 Mw that occurred between 7 – 12 October 2009

Source of the initial data: USGS/EHP; maximum quake magnitudes estimated by FEWW.]

Earthquakes tables - energy released
The total amount of energy released by the above quakes was the equivalent of the energy released by about 3,830 Hiroshima A-Bombs. [Click image to enlarge.]

Notes:
1. About 52 percent of the total energy released during the listed events came from the Vanuatu earthquake measuring 8.2 Mw.

2. A combined total of 89 percent of the energy released came from the two earthquakes highlighted in shades of blue, measuring 8.2 and 8.1 Mw respectively.

Related Links:

Posted in Alaska quake, Alaska quake forecast, Aleutian Islands quake, Halmahera quake, KURIL ISLANDS quake, maximum quake magnitudes, santa cruz islands quake, vanuatu quake | Tagged: , , , , | 19 Comments »