The Indian Ocean has now had two 8.7 or higher earthquakes in the past three months. It’s only natural to ask whether procedures to warn the region of a potential tsunami were different for today’s quake than they were in December.
The Pacific Tsunami Warning Center's first mention of a possible tsunami today was contained in its first bulletin, issued just 19 minutes after the earthquake. First mention of a possible tsunami in December didn't occur until one hour and five minutes after the triggering quake. (See this UPI report for a similar comparison.)
The much earlier warning is evidence of shifts in emphasis and perhaps policy within NOAA. What else has changed? With my PTWC visit as background (see the March 26 post), here are questions I’d like to ask its director, Dr. Charles McCreery:
• In addition to the earlier mention today of the tsunami potential, were there any other changes in the NOAA and PTWC warning protocols in effect for today's earthquake?
• What message about today's quake was sent to the news media and in what form? How long did it take for this product to be transmitted to the media? What's the media contact list?
• Was Tsunami Bulletin Number 001, issued at 6:29 a.m. HST, the primary message intended for the media? (See below)
• The warning contained in Bulletin Number 001 (emphasis added below) wasn't given much prominence; in newsroom terms, it was “buried” inside the bulletin. Was any other message sent to the media that accentuated the warning about a potential tsunami?
• What communication channels exist or have been established recently to facilitate messages from the Indian Ocean region back to the PTWC?
• If a meteorological agency in the region knows a tsunami has been created, does the PTWC receive a message from that agency – by telephone, e-mail, fax or other means?
• If such a message were received, how would the PTWC react? Would it relay that information to other agencies, to the news media, to anyone?
Today’s first bulletin was issued 19 minutes after the earthquake:
TSUNAMI BULLETIN NUMBER 001
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 1629Z 28 MAR 2005
THIS BULLETIN IS FOR ALL AREAS OF THE PACIFIC BASIN EXCEPT ALASKA - BRITISH COLUMBIA - WASHINGTON - OREGON - CALIFORNIA.
... TSUNAMI INFORMATION BULLETIN ...
THIS MESSAGE IS FOR INFORMATION ONLY. THERE IS NO TSUNAMI WARNING OR WATCH IN EFFECT.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 1610Z 28 MAR 2005
COORDINATES - 2.3 NORTH 97.1 EAST
LOCATION - NORTHERN SUMATERA INDONESIA
MAGNITUDE - 8.5
EVALUATION
THIS EARTHQUAKE IS LOCATED OUTSIDE THE PACIFIC. NO TSUNAMI THREAT EXISTS TO COASTLINES IN THE PACIFIC.
WARNING... THIS EARTHQUAKE HAS THE POTENTIAL TO GENERATE A WIDELY DESTRUCTIVE TSUNAMI IN THE OCEAN OR SEAS NEAR THE EARTHQUAKE. AUTHORITIES IN THOSE REGIONS SHOULD BE AWARE OF THIS POSSIBILITY AND TAKE IMMEDIATE ACTION. THIS ACTION SHOULD INCLUDE EVACUATION OF COASTS WITHIN A THOUSAND KILOMETERS OF THE EPICENTER AND CLOSE MONITORING TO DETERMINE THE NEED FOR EVACUATION FURTHER AWAY.
THIS CENTER DOES NOT HAVE SEA LEVEL GAUGES OUTSIDE THE PACIFIC SO WILL NOT BE ABLE TO DETECT OR MEASURE A TSUNAMI IF ONE WAS GENERATED. AUTHORITIES CAN ASSUME THE DANGER HAS PASSED IF NO TSUNAMI WAVES ARE OBSERVED IN THE REGION NEAR THE EPICENTER WITHIN THREE HOURS OF THE EARTHQUAKE.
THIS WILL BE THE ONLY BULLETIN ISSUED FOR THIS EVENT UNLESS ADDITIONAL INFORMATION BECOMES AVAILABLE.
THE WEST COAST/ALASKA TSUNAMI WARNING CENTER WILL ISSUE BULLETINS FOR ALASKA - BRITISH COLUMBIA - WASHINGTON - OREGON - CALIFORNIA.
No comments:
Post a Comment