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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