Magnitude: 8.6M
Time: 04-01-1946 T12:29:01
Country: USA

ALASKA:UNIMAKISLAND

This earthquake was recorded at a focal depth of 15km below the ground in Usa on 04-01-1946 T12:29:01, where it released a sizeable amount of seismic energy and reached a magnitude of 8.6 on the richter scale. Considering this quake occurred 15km under the surface, it is best classified as a deep geologic event. Earthquake intensity was also measured using the Mercalli intensity scale which quantifies the severity of shaking felt by the quake. On a scale of 1 (barely sensed) to 12 (completely devastating), this quake had an intensity of 6. An earthquake of this magnitude would likely be causing destruction to well-built wooden structures; most masonry and frame structures with foundations would be destroyed. Expect rails to be bent, bridges detroyed, and loss of life.
More events from USA




Surface Geology

Underlying geological composition for the surrounding area.

Alaska Peninsula and Aleutian Islands - porphyry copper
Tertiary felsic to intermediate composition intrusions of the Alaska Peninsula and Aleutian Islands
Pacific Margin - porphyry copper
Cretaceous through middle Tertiary volcanic and intrusive rocks representing a series of continental- and island-arc systems accreted and superimposed onto the paleomargin of northeast Asia.

Related USGS Publications

70159748 - 2016 - Unusually large tsunamis frequent a currently creeping part of the Aleutian megathrust
sir20155110 - 2015 - 2013 volcanic activity in Alaska: summary of events and response of the Alaska Volcano Observatory
70143609 - 2015 - Geomorphic Consequences of Volcanic Eruptions in Alaska: A Review



Latest Earthquake Events

Recent Earthquake activity from around the globe.



Nearby Tsunamis
6.7
mag
GULFOFALASKA,AK
09-27-1949 T15:30:45
6.2
mag
SKAGWAY,AK
05-01-2017 T12:31:54
6
mag
GULFOFALASKA,AK
02-23-1925 T23:53:36
8.2
mag
CAPEYAKATAGA,AK
09-04-1899 T00:22:00
8.2
mag
YAKUTATBAY,AK
09-10-1899 T21:41:00
6.9
mag
PRINCEWILLIAMSOUND,AK
09-22-1911 T05:01:24
7.5
mag
SE.ALASKA,AK
02-28-1979 T21:27:8.1
6
mag
PRINCEWILLIAMSOUND,AK
02-14-1908 T11:25:00
9.2
mag
PRINCEWILLIAMSOUND,AK
03-28-1964 T03:36:14
7.2
mag
N.CALIFORNIA
06-15-2005 T02:50:53.1




Earthquake Measurement
earthquake scale

Earthquake Stats
region_code 150
focal_depth 15
total_deaths 167
intensity 6
total_deaths_description 3
year 1946
eq_mag_ms 7.3
eq_mag_mw 8.6
id 3822
location_name ALASKA:UNIMAKISLAND
total_damage_description 4
eq_primary 8.6
state AK
total_houses_destroyed_description 3
time 04-01-1946 T12:29:01
latitude 53.492
total_damage_millions_dollars 26.271
longitude -162.832
country USA

Nearby Earthquakes
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7.7
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11-29-1975 T14:47:40
6.7
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10-15-2006 T17:07:49
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04-26-1973 T20:26:28
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09-21-1908
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04-03-1868
6.6
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02-14-1905