Haeussler said earthquake scientists will be interested in understanding the relationship between them. The quake was also in an area where two fairly strong earthquakes were reported last year. Haeussler said not much is known about that quake, but the Wednesday temblor seems to have re-ruptured the southwestern part of that area. The earthquake was in an area where a roughly magnitude 8 earthquake was recorded in 1938. “It’s not something you ever get used to, but it’s part of the job living here and being part of the community.” This is pretty normal for this area to get these kind of quakes, and when the tsunami sirens go off, it’s just something we do,” school principal Paul Barker told the Anchorage Daily News. In King Cove, up to 400 people took shelter in the school gym. This is an ongoing sequence and we will update this page as the event unfolds.In the Kenai Peninsula community of Homer, a steady stream of cars was seen evacuating the Homer Spit, a jut of land extending nearly 5 miles (8 kilometers) into Kachemak Bay that is a draw for tourists and fishermen. Though this style of earthquake is quite common, the specific location will continue to generate a lot of scientific interest. Combined we have recorded more than 6,400 aftershocks. The M7.6 earthquake generated its own aftershock sequence, which has produced more aftershocks than the M7.8 sequence. Prior to the October 19 aftershock, we recorded over 2,200 aftershocks with the largest magnitude of 6.1. M 5. The earthquake depths ranged between 0 and 165 miles (265 km). With a total of 50,289 reported earthquakes, 2019 finished as a runner up to the record-breaking 2018 (figure 1). Seismicity in Alaska had another stand-out year in 2019. Or, try our Real-time Notifications, Feeds, and Web Services. 2019 Is Runner Up for the Highest Number of Earthquakes: Alaska Seismicity Summary. The M7.6 earthquake had a different source mechanism (or faulting type) and was possibly associated with a fault inside the subducting Pacific plate rather than on the plate interface. The Earthquake Event Page application supports most recent browsers, view supported browsers. The October rupture zone is much smaller than the M7.8 fault and located farther off-shore and closer to the ocean trench where the tectonic plates meet. Early evidence suggests that this earthquake ruptured a patch that is up to 100 miles or so in length. 159km SSE of andreanof islands,Alaska 04:47:32 (IST), Unscrutinized. If you have difficulty accessing the information on this website due to a disability, please contact the web administrator by email at or by phone at 90. When an earthquake occurs, it ruptures a "patch" of this fault that can be 10s to 100s of miles long. In 1912, a series of M7+ earthquakes was associated with the Novarupta eruption, which was the largest volcanic eruption of the 20th century worldwide. These plates typically lock together and rupture on occasion in large earthquakes such as this. As the Pacific Plate creeps northward at a couple of inches per year it is slowly forced beneath the North American Plate. The July M7.8 mainshock ruptured a section of the megathrust boundary between the subducting Pacific and overriding North American tectonic plates. There are more differences than similarities between the two earthquakes. The Simeonof Earthquake series partially filled this long-recognized seismic gap. The M7.8 earthquake struck the Shumagin Islands region, just south of Simeonof Island, followed by the M7.6 aftershock. Seismologists have long suspected the “Shumagin Gap” would eventually experience a large earthquake. Historically, large earthquakes have occurred along the Aleutian Islands chain, with the exception of the region near the Shumagin Islands. These two earthquakes were also some of the most scientifically interesting of 2020. Several Alaska Peninsula communities also reported damage. The National Tsunami Warning Center issued tsunami warnings for much of the Alaska Peninsula prompting evacuations following both events. Three months later on October 19, a M7.6 aftershock shook the region again. 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. The J(July 22, 06:12 UTC) M7.8 earthquake occurred on the well-known subduction zone interface off the Alaska Peninsula. 2020 M7.8 Simeonof Earthquake and M7.6 aftershock
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