, A federal disaster was declared shortly after the earthquake and the Federal Emergency Management Agency (FEMA) deployed personnel from the state emergency operations center at Joint Base Elmendorf-Richardson to conduct relief operations. The Anchorage Police Department reported major infrastructure damage across the city. An energetic swarm began in eastern Brooks Range region in late July, with activity peaking in October. August 15-23 M6.6 and M6.3 quakes off Tanaga Island.  Aftershocks were expected to continue for around 300 days after the mainshock. The largest recent earthquakes were in 1991 and 1993, both with magnitudes of 6.9. Back in July, magnitude 5.6 and 5.9 earthquakes had struck on consecutive days about 30 miles to the east. Many roads were also damaged. This is a difficult area to study because the nearest seismic stations are far away, on Kodiak Island and the Alaska Peninsula. The expanded network increased our total in 2018 as well, but not as much as the vigorous aftershock sequences that have been hammering away since last January. The pie graph shows how much energy the largest earthquakes released relative to the state's total seismic energy release in 2018. The black histogram shows daily earthquake counts for the entire year. "I just jumped under my desk and had to ride it out," Peterson said. The rupture itself lasted for about 11 seconds, which translated to twenty seconds or more of violent shaking in Anchorage and Mat-Su. An earthquake, measured as a magnitude, 7.0, was reported between Palmer and Anchorage at 8:29 am.on Friday, Nov. 30, 2018. From a seismological perspective, this earthquake was nothing out of the ordinary. Click on a given earthquake to view the detailed event page. Ground motion visualization for the first hour after the earthquake.  In the Anchorage community of Eagle River, at least one home collapsed during the earthquake. Colony Middle School suffered damage to ceiling tiles, water pipes, and lights and was being evaluated for structural damage. This piece has been edited to reflect that revision. (CNN)More than 230 small earthquakes have hit parts of Alaska since Friday, when a 7.0-magnitude quake knocked out power, ripped open roads and splintered buildings near Anchorage, the US Geological Survey said. More than a dozen were higher than magnitude 4 and a handful greater than magnitude 5, Falsey said. Cumulative events from Jan. 2016-Nov. 2018.  Colony Middle School students were the last to return to learning. Two smaller swarms can be seen on the graph before the more prolific 2018 swarm. Helicopters and drones were assessing infrastructure across the region. For individuals, we hope that everyone is more motivated now to learn about their risks and do what they can to prepare their families and homes for large earthquakes. The previous high was 42,989 in 2017, which eclipsed 2014's record of 40,686. A driver in an SUV who was on the section of destroyed highway was stranded, but uninjured. The Glenn Highway was damaged to the point where officials stated it would likely take a long time to repair. This map shows all previous recorded earthquakes for this region. Watch as an earthquake hits Alaska Alaskans ran for cover when a 7.0 magnitude earthquake hit near Anchorage early Friday morning. You can see small deviations from the curve as aftershocks cluster or slow down, but overall the sequence forms a nice arc that is flattening out as aftershocks become less frequent. largest aftershock from the Nov. 30 Anchorage quake, evacuations in communities across southern Alaska, caused endangered pupfish to spawn out of season, felt in communities throughout southwest Alaska, strong enough to shake goods off store shelves, will not be able to open for the 2019-2020 school year, experienced anxiety and other mental health impacts, an area of considerable seismological interest, Alaska Amphibious Community Seismic Experiment, 2156 Koyukuk Drive, PO Box 757320, Fairbanks, AK 99775. The aftershock sequence has been typical for an earthquake of this type. Note how aftershock sequences drastically increased the number of earthquakes and how those sequences tapered over time.  Liquefaction was reported. The National Tsunami Warning Center immediately issued tsunami warnings, leading to evacuations in communities across southern Alaska. UAF is an AA/EO employer and educational institution and prohibits illegal discrimination against any individual. The Anchorage Police Department reported "major infrastructure damage" across the city. One aftershock moved her piano a foot and half from the wall. The largest earthquakes in the swarm are a little over M4, but most are much smaller. Tweets by AlaskaDOTPF Click to subscribe and receive updates. Earthquakes in Alaska in 2018, color-coded by depth. Instead, we have high quality recordings from a number of research-grade stations fairly close to the source.  The focal mechanism shows that the earthquake was a result of normal faulting. "It was very loud when it came," Berkowitz said Friday. An earthquake swarm is different because there is no identifiable mainshock that sets off the sequence. If you have questions or concerns about the aftershock sequence, please read this piece.  Along with Dimond High, Colony Middle, Colony High and Bartlett High School were also heavily damaged. He called it the most significant earthquake in Anchorage since 1964. Most earthquake sequences follow a mainshock-aftershock pattern, where a large earthquake is followed by a gradually tapering series of smaller earthquakes. We hope to learn more through the Alaska Amphibious Seismic Community Experiment, which collected high definition bathemtry data and placed ocean-bottom seismometers in the area in July. Despite damage to roads and buildings, no fatalities or serious injuries were reported, officials said. A magnitude 7.0 earthquake that struck near Anchorage, Alaska, on Friday morning crumbled roads and splintered buildings, sent residents scurrying for cover and triggered a … Because earthquakes are so rare there, and because in the past we had no seismic stations nearer than Nome, we have very little information to work with. , Overall, damage in Anchorage was estimated to be at least US$30 million, including $10 million to repair pipes, and $10 million in public facilities. The Y-K Delta has very few earthquakes of any size, so a magnitude 4.9—the largest ever recorded in that area—is far more newsworthy than it would be in Southcentral. One was a custodial employee who had injuries related to broken glass and one student had a possible broken wrist. This faulting in the Pacific Plate is caused by downward bending while the plate is being forced under Alaska. M4.9 Hooper Bay. "Students know to drop, get under something and hold on. The Anchorage earthquake and the much larger Offshore Kodiak earthquake both offer lessons that can make us safer in the future. Five other Mat-Su schools took over a week to reopen. It kept going and got louder and louder, and things just fell everywhere — everything off my dressers, off my bookcases, my kitchen cupboard.  Damage estimates to the Anchorage School District ranged from $25 to $50 million. Despite not normally paving during winter, area asphalt plants were restarted and within days sufficient repairs were made to reopen several heavily damaged roads. There are some indications that this region may be prone to swarm-like activity, with smaller sequences recorded in 2016 and 2017. Alaska bridges are designed to withstand seismic activity and this event put them to the test! The Matanuska-Susitna Borough School District reported that Houston Middle School, located in the town of Houston, was severely damaged, and students were forced to merge with their high school for the remainder of the year. It's not an unusual earthquake in the perspective of the tectonics of the region.". Curiously, earthquakes in this swarm lack high frequency content compared to typical crustal events in the same region. The black histogram shows daily earthquake counts for the entire year. Earthquakes in Alaska in 2018, color-coded by depth. , Alaska Governor Bill Walker said "It's been a 7.2 earthquake, but our response was a 10. historic magnitude-9.2 quake that was the most powerful recorded temblor in US history. Updated 0302 GMT (1102 HKT) December 1, 2018 (CNN) A magnitude 7.0 earthquake that struck near Anchorage, Alaska, on Friday morning crumbled … We have just learned that two Eagle River schools will not be able to open for the 2019-2020 school year. This was not an unusual type of earthquake for the region, but it was the most strongly felt in Tanana for many years, strong enough to shake goods off store shelves. Many Alaskans have also experienced anxiety and other mental health impacts from the quake and its aftershocks. Your Federal Government will spare no expense. Near Anchorage, the plates are converging at a rate of 57 mm per year. He added Saturday that the state's department of transportation mobilized four teams of bridge inspectors who remained in a 24-hour operation center until the earthquake situation was resolved. Southcentral Alaska weathered the magnitude 7.1 earthquake in remarkably good shape, but the impacts were serious. , The National Tsunami Warning Center—itself located inside the quake zone, in Palmer, Alaska, 42 miles (68 km) northeast of Anchorage—issued tsunami warnings for nearby coastal areas, including Cook Inlet and the Kenai Peninsula, but they were lifted shortly after. Philip Peterson was in a multistory building in downtown Anchorage as the structure swayed and coffee mugs fell from tables and tiles from the ceiling. In other words, the answer is no, this is is not a trend, but Alaska is always at risk from large, damaging earthquakes. Jodie Hettrick, Chief of the Anchorage Fire Department, said Saturday there were no significant earthquake-related injuries, but some municipal employees had minor injuries after diving under desks or having things fall on them. The record was mainly due to the addition of 157 new USArray stations from 2014-2016, which helped us to detect far more earthquakes in previously uninstrumented parts of the state, especially in the north and west. In court, panicked attorneys scurried under tables as a room rocked from side to side. M6.4 Kaktovik. Earlier this year, the Alaska Amphibious Community Seismic Experiment deployed ocean-bottom seismometers to this region to further our understanding of its tectonics. The depth and mechanism are consistent with faulting within the down-going Pacific Plate. Updated 0547 GMT (1347 HKT) December 2, 2018 (CNN) More than 230 small earthquakes have hit parts of Alaska since Friday, when a 7.0-magnitude quake knocked out … "At this point, though, we're not seeing a significant amount of bridge damage," Falsey said. Among the many lessons from this earthquake, we should recognize how essential local journalism is to living in Alaska. The earthquake ruptured an easterly trending strike-slip fault with motion similar to that of the Tintina and Denali faults to the south. God Bless you ALL! , Significant damage was also done to roads in the Mat-Su.
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