ALASKA: Two Earthquakes Magnitude 5 with Interval of 4 seconds

In this map there were two earthquakes Magnitude 5. Now we just have one.

WHY ???

The data are listed below.

Earthquake Details

• This event has been reviewed by a seismologist.

Magnitude	5.0 (Preliminary magnitude — update expected within 15 minutes)
Date-Time	Monday, May 09, 2011 at 19:05:00 UTC Monday, May 09, 2011 at 11:05:00 AM at epicenter
Location	54.840°N, 160.009°W
Depth	36 km (22.4 miles) set by location program
Region	ALASKA PENINSULA
Distances	63 km (39 miles) SSE (151°) from Sand Point, AK 124 km (77 miles) SSW (196°) from Ivanof Bay, AK 131 km (82 miles) SSW (205°) from Perryville, AK 927 km (576 miles) SW (225°) from Anchorage, AK
Location Uncertainty	Error estimate not available
Parameters	NST= 23, Nph= 23, Dmin=64.1 km, Rmss=1.2 sec, Gp=202°, M-type=local magnitude (ML), Version=1
Source	West Coast and Alaska Tsunami Warning Center/NOAA/NWS
Event ID	at00lkxzoc

Earthquake Details

• This event has been reviewed by a seismologist.

Magnitude	5.0
Date-Time	Monday, May 09, 2011 at 19:05:04 UTC Monday, May 09, 2011 at 11:05:04 AM at epicenter
Location	55.856°N, 161.124°W
Depth	28.9 km (18.0 miles)
Region	ALASKA PENINSULA
Distances	17 km (10 miles) SSE (163°) from Nelson Lagoon, AK 70 km (44 miles) NW (326°) from Sand Point, AK 102 km (64 miles) W (267°) from Ivanof Bay, AK 885 km (550 miles) SW (233°) from Anchorage, AK
Location Uncertainty	horizontal +/- 15.5 km (9.6 miles); depth +/- 6.4 km (4.0 miles)
Parameters	NST=232, Nph=243, Dmin=175.9 km, Rmss=1.91 sec, Gp= 83°, M-type=body wave magnitude (Mb), Version=C
Source	U.S. Geological Survey, National Earthquake Information Center: World Data Center for Seismology, Denver
Event ID	usc00039sv