Magnitude 7.5 - SANTA CRUZ ISLANDS

USGS ^

[Brian Mosely]

Magnitude 7.5 - SANTA CRUZ ISLANDS

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2007 September 02 01:05:20 UTC

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Earthquake Details

Magnitude	7.5
Date-Time		Sunday, September 02, 2007 at 01:05:20 UTC Sunday, September 02, 2007 at 12:05:20 PM at epicenter
Location	11.828°S, 165.637°E
Depth	33 km (20.5 miles) set by location program
Region		SANTA CRUZ ISLANDS
Distances	432 km (268 miles) ESE (111°) from Kira Kira, Solomon Islands 443 km (275 miles) NNW (338°) from Santo (Luganville), Vanuatu 675 km (419 miles) ESE (113°) from HONIARA, Solomon Islands 2031 km (1262 miles) E (99°) from PORT MORESBY, Papua New Guinea
Location Uncertainty		Error estimate not available
Parameters	Nst=014, Nph=014, Dmin=675.8 km, Rmss=1.81 sec, Gp=158°, M-type=moment magnitude (Mw), Version=1
Source	West Coast and Alaska Tsunami Warning Center/NOAA/NWS
Event ID	at00532552

• This event has been reviewed by a seismologist.

[Brian Mosely]

[RDTF]

oh boy

[Brian Mosely]

TSUNAMI BULLETIN NUMBER 001
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 0121Z 02 SEP 2007

THIS BULLETIN APPLIES TO AREAS WITHIN AND BORDERING THE PACIFIC
OCEAN AND ADJACENT SEAS...EXCEPT ALASKA...BRITISH COLUMBIA...
WASHINGTON...OREGON AND CALIFORNIA.

... TSUNAMI INFORMATION BULLETIN ...

THIS BULLETIN IS FOR INFORMATION ONLY.

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 - 0105Z 02 SEP 2007
COORDINATES - 11.8 SOUTH 166.0 EAST
DEPTH - SHALLOWER THAN 100 KM
LOCATION - SANTA CRUZ ISLANDS
MAGNITUDE - 7.4

EVALUATION

NO DESTRUCTIVE WIDESPREAD TSUNAMI THREAT EXISTS BASED ON
HISTORICAL EARTHQUAKE AND TSUNAMI DATA.

HOWEVER - EARTHQUAKES OF THIS SIZE SOMETIMES GENERATE LOCAL
TSUNAMIS THAT CAN BE DESTRUCTIVE ALONG COASTS LOCATED WITHIN
A HUNDRED KILOMETERS OF THE EARTHQUAKE EPICENTER. AUTHORITIES
IN THE REGION OF THE EPICENTER SHOULD BE AWARE OF THIS
POSSIBILITY AND TAKE APPROPRIATE ACTION.

THIS WILL BE THE ONLY BULLETIN ISSUED FOR THIS EVENT UNLESS
ADDITIONAL INFORMATION BECOMES AVAILABLE.

THE WEST COAST/ALASKA TSUNAMI WARNING CENTER WILL ISSUE PRODUCTS
FOR ALASKA...BRITISH COLUMBIA...WASHINGTON...OREGON...CALIFORNIA.

[bd476]

Earthquake Ping List. If you would like to be added to or removed from the Earthquake Ping List, please FReepmail me.

[bd476]

It looks like USGS has already downgraded the magnitude to 6.9. That's still a very large quake.

Magnitude 6.9 - SANTA CRUZ ISLANDS

2007 September 02 01:05:32 UTC

USGS Magnitude 6.9 - SANTA CRUZ ISLANDS 2007 September 02 01:05:32 UTC

[bd476]

USGS also changed the depth posted here:

---

Earthquake List for Map of Australia Region

Update time = Sun Sep 2 01:27:57 UTC 2007

Here is a list of the earthquakes located by the USGS and contributing networks for the Map of Australia Region. Most recent events are at the top. (Some early events may be obscured by later ones on the map.) Click on the date portion of an earthquake record in the list below for more information.

	MAG	UTC DATE-TIME y/m/d h:m:s	LAT deg	LON deg	DEPTH km	Region
MAP	6.9	2007/09/02 01:05:32	-11.623	165.566	155.5	SANTA CRUZ ISLANDS

[Lijahsbubbe]

Hi BD! Just wondering, what is considered deep for earthquakes? I have a hard time deciferin’ sometimes....

[RDTF]

is there still a tsunami warning?

[JimSEA]

In the immediate area:

The small 3.5-km-wide island of Tinakula is the exposed summit of a massive stratovolcano that rises 3-4 km from the sea floor at the NW end of the Santa Cruz islands.

Tinakula resembles Stromboli volcano in containing a breached summit crater that extends from the 851-m-high summit to below sea level.

Landslides enlarged this scarp in 1965, creating an embayment on the NW coast.

The satellitic cone of Mendana is located on the SE side.

The dominantly andesitic Tinakula volcano has frequently been observed in eruption since the era of Spanish exploration began in 1595.

In about 1840, an explosive eruption apparently produced pyroclastic flows that swept all sides of the island, killing its inhabitants.

Frequent historical eruptions have originated from a cone constructed within the large breached crater.

These have left the upper flanks of the volcano and the steep apron of lava flows and volcaniclastic debris within the breach unvegetated.

[bd476]

35 km is at the bottom of being considered a "shallow" quake. Here's a breakdown graphic showing depth:



Quakes in this area are normally pretty deep (see the green and blue dots)



Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

---

Magnitude 6.9 SANTA CRUZ ISLANDS
Sunday, September 02, 2007 at 01:05:19 UTC

Historic Seismicity




Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

[Kimberly GG]

THE WEST COAST/ALASKA TSUNAMI WARNING CENTER WILL ISSUE PRODUCTS
FOR ALASKA...BRITISH COLUMBIA...WASHINGTON...OREGON...CALIFORNIA.

Can you tell me what this means? I have a son living on Treasure Island (man made) off the coast of San Francisco and am not sure what affect, if any, this would have on him.
Thanks.

[bd476]

RDTF wrote: "is there still a tsunami warning?"

There has been no official tsunami warning issued for this earthquake.

The comment within the informational bulletin posted by Brian Mosely about the possibility of local tsunamis within the vicinity of the quake still applies.

[ThomasThomas]

Santa Cruz Islands

Not Santa Cruz Island. That why I didn’t feel it.

[RDTF]

thanks!

[IllumiNaughtyByNature]

Fooled me to. I was about to call family in CA.

[JimSEA]

There is little likelihood of any effect at all at Treasure Island, the quake is a long ways away and in the extremely unlikely event of a wave persisting that far across the Pacific, there would be ample warning as they are looking for any such wave.

The worst case scenarios are all for the local area and might include the unstable flank of a volcano sluffing off into the sea and creating a bad wave. A rise in the sea floor could create some smaller waves and a relatively shallow quake like this could give rise to something.

All that is the reason for the warning system that Southeast Asia should have been, but wasn't hooked up to. That lack of warning made the Asian Tsunami so deadly.

[Kimberly GG]

thank you so much for such a great explanation!

he has just moved there. would you recommend I ask to be on the ping list for this sort of thing?

[JimSEA]

I think plate tectonics, volcanoes and geology in general is most interesting, so yes but not out of great concern for your son. Unfortunately, earthquakes can only be generally predicted within an area. A "based on history and geology, you can expect so and so" sort of a thing. The San Francisco area is far better prepared for a bad earthquake than most of the world. Up here in the Pacific Northwest, we are far less prepared but we will eventually have a large destructive quake.

It hasn't cost me any sleep.

[blam]

I'm watching "Tsunamis: Megadisasters" on the History Channel, presently.

Maybe I'll just go to bed.

[Global2010]

Isn’t Treasure Island a Naval Base?