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= Absolute and relative locations of earthquakes at Mount St. Helens, Washington, using continuous data: Implications for magmatic processes =
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This study uses a combination of absolute and relative locations from earthquake multiplets to investigate the seismicity associated with the eruptive sequence at Mount St. Helens between September 23, 2004, and November 20, 2004. Multiplets, a prominent feature of seismicity during this time period, occurred as volcano-tectonic, hybrid, and low-frequency earthquakes spanning a large range of magnitudes and lifespans. Absolute locations were improved through the use of a new one-dimensional velocity model with excellent shallow constraints on P-wave velocities. We used jackknife tests to minimize possible biases in absolute and relative locations resulting 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 structure under the 1980-86 dome. Relative relocations of multiplets during the initial seismic unrest and ensuing eruption showed rather small source volumes before the October 1 explosion and larger tabular source volumes after October 5. All multiplets possess absolute locations very close to each other. However, the highly dissimilar waveforms displayed by each of the multiplets analyzed suggest that different sources and mechanisms were present within a very small source volume. We suggest that multiplets were related to pressurization of the conduit system that produced a stationary source that was highly stable over long time periods. On the basis of their response to explosions occurring in October 2004, earthquakes not associated with multiplets also appeared to be pressure dependent. The pressure source for these earthquakes appeared, however, to be different from the pressure source of the multiplets.
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      "abstract": "This study uses a combination of absolute and relative locations from earthquake multiplets to investigate the \nseismicity associated with the eruptive sequence at Mount St. \nHelens between September 23, 2004, and November 20, 2004. \nMultiplets, a prominent feature of seismicity during this time \nperiod, occurred as volcano-tectonic, hybrid, and low-frequency earthquakes spanning a large range of magnitudes and \nlifespans. 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.",
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     "abstract": "This study uses a combination of absolute and relative locations from earthquake multiplets to investigate the \nseismicity associated with the eruptive sequence at Mount St. \nHelens between September 23, 2004, and November 20, 2004. \nMultiplets, a prominent feature of seismicity during this time \nperiod, occurred as volcano-tectonic, hybrid, and low-frequency earthquakes spanning a large range of magnitudes and \nlifespans. 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.",
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