Title

Volcanic Seismology

Document Type

Article

Publication Date

2005

Keywords

volcanic tremor, triggered seismicity, b-value anomalies, low-frequency events, very-long-period events

Digital Object Identifier (DOI)

http://dx.doi.org/10.1146/annurev.earth.33.092203.122459

Abstract

Recent developments in volcanic seismology include new techniques to improve earthquake locations that have changed clouds of earthquakes to lines (faults) for high-frequency events and small volumes for low-frequency (LF) events. Spatial mapping of the b-value shows regions of normal b and high b anomalies at depths of 3–4 and 7–10 km. Increases in b precede some eruptions. LF events and very-long-period (VLP) events have been recorded at many volcanoes, and models are becoming increasingly sophisticated. Deep long-period (LP) events are fairly common, but may represent several processes. Acoustic sensors have greatly improved the study of volcanic explosions. Volcanic tremor is stronger for fissure eruptions, phreatic eruptions, and higher gas contents. Path and site effects can be extreme at volcanoes. Seismicity at volcanoes is triggered by large earthquakes, although mechanisms are still uncertain. A number of volcanoes have significant deformation with very little seismicity. Tomography has benefited from improved techniques and better instrumental arrays.

Was this content written or created while at USF?

No

Citation / Publisher Attribution

Annual Review of Earth and Planetary Sciences, v. 32, p. 461-491

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