Thursday, October 25, 2007

Tsunami Warning Spam

The Pacific Tsunami Warning Center Issued a Tsunami Watch for Indonesia at 2114z 24 Oct 2007. Fortunately there was no Tsunami, but the warning message was rated 1.4 by the Spam Assen Spam filter. As I noted previously, there is a risk such messages may be blocked in transmission by Spam filters. The format of such messages need to be changed to make them look less like spam. This could be done at the same time as other changes to make the messages more readable.
Subject: {SPAM 01.4} [Tsunami Message - IOC] Local Tsunami Watch Bulletin
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TSUNAMI BULLETIN NUMBER 001
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 2114Z 24 OCT 2007

THIS BULLETIN IS FOR ALL AREAS OF THE INDIAN OCEAN.

... A LOCAL TSUNAMI WATCH IS IN EFFECT ...

A TSUNAMI WATCH IS IN EFFECT FOR

INDONESIA

FOR OTHER AREAS OF THE INDIAN OCEAN REGION, THIS MESSAGE IS AN
ADVISORY ONLY.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

ORIGIN TIME - 2103Z 24 OCT 2007
COORDINATES - 4.1 SOUTH 100.8 EAST
LOCATION - SOUTHWEST OF SUMATRA INDONESIA
MAGNITUDE - 7.0

EVALUATION

A DESTRUCTIVE WIDESPREAD TSUNAMI THREAT DOES NOT EXIST BASED ON
HISTORICAL EARTHQUAKE AND TSUNAMI DATA.

HOWEVER - THERE IS THE POSSIBILITY OF A LOCAL TSUNAMI THAT
COULD AFFECT COASTS LOCATED USUALLY NO MORE THAN A HUNDRED
KILOMETERS FROM THE EARTHQUAKE EPICENTER. AUTHORITIES FOR THE
REGION NEAR THE EPICENTER SHOULD BE AWARE OF THIS POSSIBILITY.
AREAS FURTHER FROM THE EPICENTER COULD EXPERIENCE SMALL SEA
LEVEL CHANGES AND STRONG OR UNUSUAL COASTAL CURRENTS.

DUE TO ONLY LIMITED SEA LEVEL DATA FROM THE REGION IT MAY NOT
BE POSSIBLE FOR THIS CENTER TO RAPIDLY CONFIRM NOR EVALUATE THE
STRENGTH OF A TSUNAMI IF ONE HAS BEEN GENERATED.

ESTIMATED INITIAL TSUNAMI WAVE ARRIVAL TIMES. ACTUAL ARRIVAL TIMES
MAY DIFFER AND THE INITIAL WAVE MAY NOT BE THE LARGEST. THE TIME
BETWEEN SUCCESSIVE TSUNAMI WAVES CAN BE FIVE MINUTES TO ONE HOUR.

LOCATION COORDINATES ARRIVAL TIME
-------------------------------- ------------ ------------
INDONESIA BENGKULU 3.9S 102.0E 2134Z 24 OCT

THIS WILL BE THE ONLY BULLETIN ISSUED BY THE PACIFIC TSUNAMI
WARNING CENTER FOR THIS EVENT UNLESS ADDITIONAL INFORMATION
BECOMES AVAILABLE.

THE JAPAN METEOROLOGICAL AGENCY MAY ISSUE ADDITIONAL INFORMATION
FOR THIS EVENT.

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