Non-volcanic seismic swarms triggered by circulating fluids and pressure fluctuations above a solidified diorite intrusion

Details Non-volcanic seismic swarms triggered by circulating fluids and pressure fluctuations above a solidified diorite intrusion Non-volcanic seismic swarms triggered by circulating fluids and pressure fluctuations above a solidified diorite intrusion

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3715302k&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 15, CiteID L15302

Other

5

Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Seismology: Tomography (6982, 8180), Structural Geology: Role Of Fluids, Tectonophysics: Dynamics And Mechanics Of Faulting (8004), Tectonophysics: Hydrothermal Systems (0450, 1034, 3017, 3616, 4832, 8424)

Scientific paper

A non-volcanic seismic swarm is often assumed to be tied to fluid movements, based on earthquake migrations obeying a diffusion equation. However, seismological observations that relate to the presence and driving force of migrating fluids are not well documented. Here we present high-resolution tomographic imaging of seismic velocities in the Wakayama district, Japan, characterized by intense seismic swarms and high heat flow. Earthquake clusters at depths of 4-6 km are distributed within a zone with low-Vp and anomalously low-Vp/Vs. The existence of this low-Vp/Vs anomaly is supported by another estimate using waveform cross-correlation data from similar event clusters. We suggest that these anomalies are caused by fluid-filled pores with relatively high aspect ratios. Just beneath the clusters of earthquakes, a prominent high-velocity zone is clearly imaged. It lacks earthquakes, and could represent a body of intruded diorite related to past volcanism. We propose that non-volcanic seismic swarms are triggered by circulating fluids and fluid pressure fluctuations driven by the thermal anomaly of the solidified diorite magma.

Affiliated with

Also associated with

No associations

Rating

Non-volcanic seismic swarms triggered by circulating fluids and pressure fluctuations above a solidified diorite intrusion does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Non-volcanic seismic swarms triggered by circulating fluids and pressure fluctuations above a solidified diorite intrusion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-volcanic seismic swarms triggered by circulating fluids and pressure fluctuations above a solidified diorite intrusion will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-980197