Sizes of crosses are proportional to event magnitudes. Epicenters of most of the July 1980 events at Mt. The swarm's total seismic energy release. A M earthquake at 0259 and a M event at 1315 were centered at km depth. Helens, began with a M shock on 6 July at 1817. A series of earthquakes in the vicinity of Mt. All times are local (unless otherwise noted) Information is preliminary and subject to change. The current swarm consisted of fewer and smaller events than is typical, but it may not have yet ended. This activity is not abnormal Mount Hood averages one to two small swarms a year, with the last swarm occurring in May 2000. The Cascades Volcano Observatory (CVO) reported that during 10-20 January a swarm of 13 earthquakes with magnitudes ranging from 0.2-2.0 occurred in an area about 4-8 km SSE of the summit at a depth of 4-7 km. Source: US Geological Survey Cascades Volcano Observatory (CVO)ġ7 January-23 January 2001 Cite this Report These types of swarms occur once or twice per year at Mount Hood. The epicenters of the earthquakes were ~8 km SSW of the volcano's summit at depths of 1-7 km. About 25 events were detected, with a maximum magnitude of 2.9. The USGS Cascades Volcano Observatory reported that a minor earthquake swarm occurred at Mount Hood from 9 September until at least 14 September. Sources: US Geological Survey Cascades Volcano Observatory (CVO) Associated Pressġ2 September-18 September 2001 Cite this Report Typically, several earthquake swarms occur each year at Mount Hood. Hundreds of aftershocks followed, including two greater than M 3. The widely felt M 4.5 event was located ~4.5 km S of the summit at a depth of 6 km. CVO reported that the strongest earthquake in the Mount Hood area in decades occurred on 29 June at 0736.
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