Detecting low-frequency earthquakes within non-volcanic tremor in southern Taiwan triggered by the 2005 Mw8.6 Nias earthquake
Article first published online: 25 AUG 2010
Copyright 2010 by the American Geophysical Union.
Geophysical Research Letters
Volume 37, Issue 16, August 2010
How to Cite
2010), Detecting low-frequency earthquakes within non-volcanic tremor in southern Taiwan triggered by the 2005 Mw8.6 Nias earthquake, Geophys. Res. Lett., 37, L16307, doi:10.1029/2010GL043918., , , , and (
- Issue published online: 25 AUG 2010
- Article first published online: 25 AUG 2010
- Manuscript Accepted: 30 JUN 2010
- Manuscript Revised: 24 JUN 2010
- Manuscript Received: 17 MAY 2010
- deep fault slip;
- low-frequency earthquake;
- triggered tremor
 We use a matched filter technique to detect 41 low-frequency earthquakes (LFEs) within 700-s of triggered tremor signals in the Southern Central Range in Taiwan during the surface waves of the 2005 Mw8.6 Nias earthquake off the coast of northern Sumatra. The depth distributions of LFEs after double-difference relocations concentrate at the depth range of 12–38 km below the background seismicity and above the Moho depth inferred from receiver function studies. The locations of LFEs are close to the downward extension of the steep-dipping Chaochou-Lishan fault with only modestly high Vp/Vs ratios (1.75–1.85). Our observation indicates that at least portions of triggered tremor consists of many LFEs, similar to ambient tremor observed at other major plate boundary faults.