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A strong and shallow earthquake registered by the USGS as M7.0 hit Anchorage, Alaska at 17:29 UTC (08:29 AKST) on November 30, 2018. The agency is reporting a depth of 42.8 km (29.9 miles). EMSC is reporting M7.0 at a depth of 45 km (28 miles). The quake was followed by M5.8 at 17:35 UTC.
According to the USGS, the epicenter was located 4.1 km (2.6 miles) SE of Point MacKenzie (population 529), 12.7 km (7.9 miles) N of Anchorage (population 298 695) and 19.4 km (12.1 miles) W of Eagle River (population 24 793), Alaska.
There are about 390 000 people living within 100 km (62 miles).
Some 52 000 people are estimated to have felt very strong shaking, 277 000 strong, 48 000 moderate, 70 000 light and 1 000 weak.
The quake caused widespread power outages and damage.
A tsunami warning is in effect for coastal areas of Cook Inlet and Southern Kenai Peninsula, Alaska.
Full NTWC Tsunami Warning Message Number 2, issued 18:05 UTC:
WEAK51 PAAQ 301805 TSUAK1 BULLETIN Public Tsunami Message Number 2 NWS National Tsunami Warning Center Palmer AK 905 AM AKST Fri Nov 30 2018 UPDATES ------- * Revised magnitude ...THE TSUNAMI WARNING REMAINS IN EFFECT... Tsunami Warning in Effect for; * COASTAL AREAS OF COOK INLET AND SOUTHERN KENAI PENINSULA IN ALASKA For other US and Canadian Pacific coasts in North America, the level of tsunami danger is being evaluated. Further information will be provided in supplementary messages. PRELIMINARY EARTHQUAKE PARAMETERS - UPDATED ------------------------------------------- * The following parameters are based on a rapid preliminary assessment and changes may occur. * Magnitude 7.0 * Origin Time 0829 AKST Nov 30 2018 0929 PST Nov 30 2018 1729 UTC Nov 30 2018 * Coordinates 61.3 North 149.9 West * Depth 25 miles * Location 35 miles SW of Palmer, Alaska 5 miles N of Anchorage, Alaska FORECASTS OF TSUNAMI ACTIVITY ----------------------------- * Tsunami activity is forecasted to start at the following locations at the specified times. FORECAST START SITE OF TSUNAMI ---- ---------- * Alaska Kodiak 0925 AKST Nov 30 Seward 0930 AKST Nov 30 Homer 1145 AKST Nov 30 OBSERVATIONS OF TSUNAMI ACTIVITY -------------------------------- * No tsunami observations are available to report. RECOMMENDED ACTIONS ------------------- Actions to protect human life and property will vary within tsunami warning areas. If you are in a tsunami warning area; * Evacuate inland or to higher ground above and beyond designated tsunami hazard zones or move to an upper floor of a multi-story building depending on your situation. * Move out of the water, off the beach, and away from harbors, marinas, breakwaters, bays and inlets. * Be alert to and follow instructions from your local emergency officials because they may have more detailed or specific information for your location. * If you feel a strong earthquake or extended ground rolling take immediate protective actions such as moving inland and/or uphill preferably by foot. * Boat operators, * Where time and conditions permit, move your boat out to sea to a depth of at least 180 feet. * If at sea avoid entering shallow water, harbors, marinas, bays, and inlets to avoid floating and submerged debris and strong currents. * Do not go to the shore to observe the tsunami. * Do not return to the coast until local emergency officials indicate it is safe to do so. IMPACTS ------- Impacts will vary at different locations in the warning areas. If you are in a tsunami warning area; * A tsunami with damaging waves and powerful currents is possible. * Repeated coastal flooding is possible as waves arrive onshore, move inland, and drain back into the ocean. * Strong and unusual waves, currents and inland flooding can drown or injure people and weaken or destroy structures on land and in water. * Water filled with floating or submerged debris that can injure or kill people and weaken or destroy buildings and bridges is possible. * Strong and unusual currents and waves in harbors, marinas, bays, and inlets may be especially destructive. * Some impacts may continue for many hours to days after arrival of the first wave. * The first wave may not be the largest so later waves may be larger. * Each wave may last 5 to 45 minutes as a wave encroaches and recedes. * Coasts facing all directions are threatened because the waves can wrap around islands and headlands and into bays. * Strong shaking or rolling of the ground indicates an earthquake has occurred and a tsunami may be imminent. * A rapidly receding or receded shoreline, unusual waves and sounds, and strong currents are signs of a tsunami. * The tsunami may appear as water moving rapidly out to sea, a gentle rising tide like flood with no breaking wave, as a series of breaking waves, or a frothy wall of water. ADDITIONAL INFORMATION AND NEXT UPDATE -------------------------------------- * Refer to the internet site tsunami.gov for more information. * Pacific coastal residents outside California, Oregon, Washington, British Columbia and Alaska should refer to the Pacific Tsunami Warning Center messages at tsunami.gov. * This message will be updated within 30 minutes. $$
The USGS issued a green alert for shaking-related fatalities. There is a low likelihood of casualties.
A yellow alert was issued for economic losses. Some damage is possible and the impact should be relatively localized. Estimated economic losses are less than 1% of GDP of the United States. Past events with this alert level have required a local or regional level response.
Overall, the population in this region resides in structures that are resistant to earthquake shaking, though vulnerable structures exist. The predominant vulnerable building types are unreinforced brick masonry and reinforced masonry construction.
Recent earthquakes in this area have caused secondary hazards such as landslides and liquefaction that might have contributed to losses.
Estimated population exposure to earthquake shaking
Selected cities exposed
For most up to date information on the tsunami, please check https://www.tsunami.gov/ and the following Twitter accounts:
Featured image credit: Google, USGS, TW