Record details

Title
    Determination and uncertainty of moment tensors for microearthquakes at Okmok Volcano, Alaska
Author
    Pesicek, J. D.
    Prejean, S. G.
    Šílený, Jan
    Thurber, C. H.
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Geophysical Journal International
Vol./nr.
    Roč. 190, č. 3
Pages
    s. 1689-1709
Year
    2012
Notes
    Projekt: GAP210/12/2235, GA ČR3cav_un_auth*0284894
    Rozsah: 21 s. : P
    Výzkumný záměr: CEZ:AV0Z30120515
Subject category
    body waves
    earthquake source observations
    volcano seismology
Keyword
    Alaska
    Determination
    Microearthquakes
    Moment
    Okmok
    Tensors
    Uncertainty
    Volcano
Abstract (in english)
   Efforts to determine general moment tensors (MTs) for microearthquakes in volcanic areas are often hampered by small seismic networks, which can lead to poorly constrained hypocentres and inadequate modelling of seismic velocity heterogeneity. In addition, noisy seismic signals can make it difficult to identify phase arrivals correctly for small magnitude events. However, small volcanic earthquakes can have source mechanisms that deviate from brittle double-couple shear failure due to magmatic and/or hydrothermal processes. Thus, determining reliable MTs in such conditions is a challenging but potentially rewarding pursuit. We pursued such a goal at Okmok Volcano, Alaska, which erupted recently in 1997 and in 2008. The Alaska Volcano Observatory operates a seismic network of 12 stations at Okmok and routinely catalogues recorded seismicity.
Contributor
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
    U
Import date
    9. 12. 2013