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Preliminary analysis of volcanoseismic signals recorded at the Tatun Volcano Group, northern Taiwan
Author(s) -
Lin C. H.,
Konstantinou K. I.,
Liang W. T.,
Pu H. C.,
Lin Y. M.,
You S. H.,
Huang Y. P.
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl022861
Subject(s) - volcano , seismology , geology , monochromatic color , tectonics , hazard analysis , mud volcano , group (periodic table) , physics , engineering , aerospace engineering , optics , quantum mechanics
The Tatun Volcano Group lies at the northern tip of Taiwan only 15 km north of the capital Taipei. A seismic array consisting of 5 stations equipped with both broadband and short‐period sensors was installed in 2003 in order to monitor the seismic activity of the area. It recorded a variety of events including common volcano‐tectonic earthquakes and volcanoseismic signals like tornillos, short duration monochromatic events (10–15 s) and long duration spasmodic bursts (∼15 min). An analysis of the complex frequencies of the tornillo/monochromatic signals shows that Q‐values are of the order of several hundreds. Based on the model of a fluid‐filled crack, such Q‐values can result from the oscillations of a crack containing a misty or dusty gas. These observations put into doubt the long‐standing suggestion that the Tatun volcanoes are extinct and prompt for a thorough assessment of the volcanic hazard for this area.