Powerful 8.9 quake of Sumatra on 11th April 2012

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#1

Powerful 8.9 quake of Sumatra on 11th April 2012

8.9 quake of Sumatra reported. Yet to see a Tsunami warning for the Indian coast. Indonesia has apparently issued one already. Some aftershocks felt in Chennai. Will update this thread based on info I receive.
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#2
Tsunami warning issued.
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#3

Updates

Tsunami warning issued to 27 countries including India and Srilanka.
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#4
Tremor felt in Kolkata !!!

In the 6th floor of my office, I felt chairs trembling, saw tube-lights with frame undulating....

We ran downstairs.... found collapsible-gates shaking....


Spent some time in ground floor...

Watched the news of 8.9 quake in Sumatra.... tremor felt in Kolkata as well as Banglore, Chennai too.

Tsumani warning issued...

Warning in West Bengal Sea-beaches issued (Digha specially).

Underground Metro Rail in Kolkata stopped running.
aamar payer tolai sorshe...(I have wheels under my feet)
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#5
Nightmare..
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#6
From: http://ptwc.weather.gov/ptwc/text.ph...012.04.11.0845

Quote:
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 0921Z 11 APR
BANDA_ACEH 5.5N 95.1E 0931Z 11 APR
SIBERUT 1.5S 98.7E 0941Z 11 APR
PADANG 0.9S 100.1E 1017Z 11 APR
BENGKULU 3.9S 102.0E 1038Z 11 APR
CILACAP 7.8S 108.9E 1205Z 11 APR
BANDAR_LAMPUNG 5.7S 105.3E 1213Z 11 APR
BALI 8.7S 115.3E 1253Z 11 APR
KUPANG 10.0S 123.4E 1338Z 11 APR
BELAWAN 3.8N 98.8E 1348Z 11 APR
BALI 8.7S 115.3E 1253Z 11 APR
INDIA GREAT_NICOBAR 7.1N 93.6E 0937Z 11 APR
LITTLE_ANDAMAN 10.7N 92.3E 1016Z 11 APR
PORT_BLAIR 11.9N 92.7E 1032Z 11 APR
NORTH_ANDAMAN 13.3N 92.6E 1052Z 11 APR
CHENNAI 13.4N 80.4E 1127Z 11 APR
KAKINADA 17.2N 82.7E 1205Z 11 APR
TRIVANDRUM 8.3N 76.9E 1208Z 11 APR
MANGALORE 13.3N 74.4E 1336Z 11 APR
BOMBAY 18.8N 72.6E 1608Z 11 APR
GULF_OF_KUTCH 22.7N 68.9E 1634Z 11 APR
SRI LANKA DONDRA_HEAD 5.9N 80.6E 1039Z 11 APR
TRINCOMALEE 8.7N 81.3E 1051Z 11 APR
COLOMBO 6.9N 79.8E 1120Z 11 APR
JAFFNA 9.9N 80.0E 1231Z 11 APR............
Sorry, it's losing formatting but basically it's the estimated tsunami wave arrival times with coordinates from NOOA - US (National Oceanic and Atmospheric Administration)

Link again: http://ptwc.weather.gov/ptwc/text.ph...012.04.11.0845


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#7
Earthquake felt across...

is breaking news.


Apparently the tremors were felt in Thailand as well as Singapore.
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#8
Tremours felt in Chennai.

Tsunami warning specific to Nicobar Islands issued.

Evacuation operations were in full swing, in my office - the doors were thrown open after half an hour.
Be Bold, Be Confident, Be Happy, for you are on the right path..

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#9
This is the Indian coast specific bulletin issued by the India Early Warning Center.

http://www.incois.gov.in/DSSProducts...x_NTWC_pub.htm
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#10

Exclamation 8.7 quake; India issues Tsunami warning

Quote:
India issued a tsunami warning for Andaman and Nicobar Islands and the eastern coast on Wednesday after a 8.7 magnitude quake in Indonesia shook major cities, causing panic and sending people fleeing onto the streets.
Quote:
India's tsunami warning center said waves measuring up to 6 metres were expected along parts of its eastern coast, which was heavily hit by the 2004 tsunami. Smaller waves were expected to hit the remote Andaman and Nicobar islands.
http://www.hindustantimes.com/world-...e1-838911.aspx

Stay safe people. Stay away from coast till cleared by authorities.
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#11
Scientific information, detail, etc here.
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#12
Mod Note
I have merged 2 threads here. This is now in the NEWS forum.
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#13
The Indian alert system seems to indicate that their measurements indicate a wave was generated.

The Indian site seems to be down. I remember noting the projected wave amplitude as 3 mts at Indira Point, A&N Islands and 1.2 Mts for Chennai.
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#14
  • ...and thanks to a confusion regarding where the tsunami warning is for, half the team working in the Chennai office of my firm (and that would be several hundred people) have left for home ...
  • The port of Chennai has been closed.
  • Waves are expected to strike between 4:30-5 pm in Chennai as per some news sources and people have been asked to stay away from the beach.
Last edited by vaibhav_arora; Apr 11th, 2012 at 16:52.. Reason: more inputs
#15
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#15
The first waves reported close to the earthquake.

Stay safe everyone.

**********

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

GAUGE LOCATION LAT LON TIME AMPL PER
------------------- ----- ------ ----- --------------- -----
DART 23401 8.9N 88.5E 0956Z 0.03M / 0.1FT 06MIN
MEULABOH ID 4.1N 96.1E 0950Z 0.27M / 0.9FT 14MIN
SABANG ID 5.8N 95.3E 0956Z 0.31M / 1.0FT 08MIN

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.
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