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Absolute locations were improved through the use \nof a new one-dimensional velocity model with excellent shallow constraints on P-wave velocities. We used jackknife tests \nto minimize possible biases in absolute and relative locations \nresulting from station outages and changing station configurations. In this paper, we show that earthquake hypocenters shallowed before the October 1 explosion along a north-dipping \nstructure under the 1980-86 dome. Relative relocations of \nmultiplets during the initial seismic unrest and ensuing eruption showed rather small source volumes before the October 1 \nexplosion and larger tabular source volumes after October 5. \nAll multiplets possess absolute locations very close to each \nother. However, the highly dissimilar waveforms displayed by \neach of the multiplets analyzed suggest that different sources \nand mechanisms were present within a very small source \nvolume. We suggest that multiplets were related to pressurization of the conduit system that produced a stationary source \nthat was highly stable over long time periods. On the basis \nof their response to explosions occurring in October 2004, \nearthquakes not associated with multiplets also appeared to be pressure dependent. The pressure source for these earthquakes \nappeared, however, to be different from the pressure source of \nthe multiplets.", "description": "25 p.", "publisher": { "@type": "Organization", "name": "U.S. Geological Survey" }, "author": [ { "@type": "Person", "name": "Thelen, Weston A. wthelen@usgs.gov", "givenName": "Weston A.", "familyName": "Thelen", "email": "wthelen@usgs.gov", "affiliation": [ { "@type": "Organization", "name": "Volcano Science Center", "url": "https://www.usgs.gov/centers/volcano-science-center" } ] }, { "@type": "Person", "name": "Crosson, Robert S.", "givenName": "Robert S.", "familyName": "Crosson" }, { "@type": "Person", "name": "Creager, Kenneth C.", "givenName": "Kenneth C.", "familyName": "Creager" } ], "editor": [ { "@type": "Person", "name": "Sherrod, David R. dsherrod@usgs.gov", "givenName": "David R.", "familyName": "Sherrod", "email": "dsherrod@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0001-9460-0434", 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