You can read more about ShakeMaps and how they are generated on the USGS website. The Chignik Earthquake depth was approximately 28.5 miles, an intermediate-depth earthquake. The preliminary focal mechanism solution indicates rupture occurred on a fault dipping either shallowly to the northwest. At 10:15pm Alaska time on July 28, a magnitude 8.2 earthquake struck offshore of the Alaska Peninsula, the largest U.S. ShakeMaps use MMI to answer those questions. The July 16, 2023, M 7.2 earthquake south of Sand Point, Alaska (south of the Alaska Peninsula), occurred as the result of thrust faulting on or near the subduction zone interface between the Pacific and North America plates. MMI tells us more about the local effects of an earthquake than magnitude because magnitude only describes the energy released by the earthquake at its epicenter.įor example, if we know that a large earthquake has occurred away from a populated area, our most immediate concern is how strongly that earthquake shook the nearest places where people live or that contain vital infrastructure. Each color corresponds to a number on the Modified Mercalli Intensity Scale (MMI) (link or sidebar), which was created to describe an earthquake’s severity in a given place. ShakeMaps are color-coded to show how strongly the ground shook in different places. They are also used by engineers, city planners, and scientists, and they can show predicted effects from hypothetical earthquakes as well as real ones. The data are released on the condition that none of the cooperating agencies may be held liable for any damaged resulting from its authorized or unauthorized use.įor more information on earthquakes and seismology, contact the AEC at 90.ShakeMaps use recorded and predicted ground motions to show where and how intensely the ground shook during an earthquake-most crucially, they help emergency managers to identify areas of likely damage within minutes of a significant earthquake. Established in 2018, NSFs Seismological Facility for the Advancement of Geoscience (SAGE) is a distributed, multi-user national facility operated by EarthScope. The earthquake parameters have been determined by the AEC, with supplemental data provided by the USGS National Earthquake Information Center. The data in this report are preliminary and subject to revision. Magnitude 3.6, 92 miles SW of Point Hope, August 26 06:01:17 AKDT We have reviewed a M4.9 event at 3:03 pm, 14 miles NW of Anchorage & 29 miles deep. Magnitude 3.7, 29 miles SW of Willow, August 27 03:27:00 AKDT According to the Alaska Earthquake Center, the quake was felt throughout Anchorage and the Mat-Su. Magnitude 3.7, 51 miles SW of Sand Point, August 27 13:56:07 AKDT Weak shaking was felt more than 500 miles away in the Mat-Su and Anchorage areas. Strong shaking was reported from Perryville and Sand Point to King Cove and Cold Bay. Magnitude 3.7, 60 miles S of Nikolski, August 26 17:31:52 AKDT The J(July 22, 06:12 UTC) M7.8 earthquake occurred on the well-known subduction zone interface off the Alaska Peninsula. Magnitude 3.7, 19 miles W of Iliamna Volcano, August 23 10:51:52 AKDT (Map from Miller, Great Waves in Lituya Bay, Alaska) During the earthquake, the bay side of Gilbert and Crillon inlets moved about 20 feet northwest relative to the northeast wall that forms the head of the bay. Magnitude 3.8, 24 miles SE of Kagamil Island, August 25 06:26:26 AKDT Lituya Bay (at center left) offers the only sheltered anchorage for a long stretch of Southeast coast. Magnitude 3.8, 40 miles SE of Semisopochnoi Island, August 22 06:31:09 AKDT Magnitude 3.9, 63 miles S of Nikolski, August 26 11:46:43 AKDT The largest earthquake was magnitude 5.1 that occurred on April 8 at 12:25:11 AKDT (April 8, 20:25:11 UTC), 28 miles SE of Akutan. Magnitude 3.9, 17 miles E of Amukta Pass, August 24 00:33:33 AKDT During the month of April 2023, the Alaska Earthquake Center reported 3963 earthquakes within the state with magnitudes ranging between 0.3 and 5.1 and the depth between 0-242 km. Magnitude 4.0, 19 miles SE of Semisopochnoi Island, August 21 06:45:05 AKDT The center also said Alaska recorded last year’s most powerful and third-most. USGS Magnitude 2.5+ Earthquakes, Past Day 26 earthquakes. The Alaska Earthquake Center reported more than 49,000 seismic events in the state and nearby regions in 2020. NOTABLE EVENTS IN DESCENDING ORDER OF MAGNITUDE If the application does not load, try our legacy Latest Earthquakes application.
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