Update posted at 8 p.m. Sept. 9The USGS reports a swarm of small below-sea earthquakes off the Oregon coast occurred over the past two days.The largest, a 5.8 magnitude tremor occurred at 9:08 p.m. Monday, Sept. 8. Three smaller quakes were registered Tuesday morning and more occurred Tuesday afternoon.#placement_573654_0_i{width:100%;max-width:550px;margin:0 auto;}var rnd = window.rnd || Math.floor(Math.random()*10e6);var pid573654 = window.pid573654 || rnd;var plc573654 = window.plc573654 || 0;var abkw = window.abkw || '';var absrc = 'https://ads.empowerlocal.co/adserve/;ID=181918;size=0x0;setID=573654;type=js;sw='+screen.width+';sh='+screen.height+';spr='+window.devicePixelRatio+';kw='+abkw+';pid='+pid573654+';place='+(plc573654++)+';rnd='+rnd+';click=CLICK_MACRO_PLACEHOLDER';var _absrc = absrc.split("type=js"); absrc = _absrc[0] + 'type=js;referrer=' + encodeURIComponent(document.location.href) + _absrc[1];document.write('');A 4.9 magnitude quake 141 miles west of Coos Bay was registered at 12:02 p.m. Sept. 9. Followed by a magnitude 5.1 tremor 140 miles west of Coos Bay and a 4.4 tremor 129 miles west of Coos Bay, both occurring at 12:31 p.m.Previous coverage posted at 7 a.m. Sept.9The U.S. Geological Survey (USGS) reports a magnitude 5.8 earthquake occurred at 9:08 p.m. Monday, Sept. 8, approximately 100 miles west of Port Orford along the Oregon coast.Three other smaller quakes followed the 5.8 magnitude quake, a 4.9 magnitude at 10:59 p.m. Monday. A 3.1 tremor was registered at 1:05 a.m. Tuesday, followed by a 4.3 magnitude tremor that occurred at 4:47 a.m. Tuesday.No tsunami is expected from these below-sea quakes.The Oregon Emergency Management Department (OEM) has stated in previous publish interviews, that the area where the undersea tremors have occurred is a region where earthquakes are common.View the USGS details of this latest activity at:https://earthquake.usgs.gov/earthquakes/eventpage/us7000quwy/executive?utm_medium=email&utm_source=ENS&utm_campaign=realtime googletag.cmd.push(function() { googletag.display('ad-1515727'); });