Title:
Detecting deep tectonic tremor in Taiwan using dense arrays
Detecting deep tectonic tremor in Taiwan using dense arrays
| dc.contributor.advisor | Peng, Zhigang | |
| dc.contributor.author | Sun, Wei-Fang | |
| dc.contributor.committeeMember | Newman, Andrew V. | |
| dc.contributor.committeeMember | Huber, Christian | |
| dc.contributor.department | Earth and Atmospheric Sciences | |
| dc.date.accessioned | 2016-01-07T17:20:40Z | |
| dc.date.available | 2016-01-07T17:20:40Z | |
| dc.date.created | 2014-12 | |
| dc.date.issued | 2014-08-06 | |
| dc.date.submitted | December 2014 | |
| dc.date.updated | 2016-01-07T17:20:40Z | |
| dc.description.abstract | Deep tectonic tremor has been observed in major subduction zones, strike-slip faults, inland faulting systems, and arc-continent collision environments around the Pacific Rim. However, detailed space-time evolution of its source locations remains enigmatic because of difficulties in detecting and locating tremor accurately. In 2011, we installed two dense, small-aperture seismic arrays aiming to detect ambient tremor source beneath southern Central Range in Taiwan. We recorded continuous waveforms for a total of 134 days, including tremor triggered by the great 2011 Mw9.0 Tohoku earthquake. We use the broadband frequency-wavenumber beamforming and the moving-window grid-search methods to compute array parameters for detecting seismic signals. The obtained array parameters closely match both relocated local earthquakes and triggered tremor bursts located by an envelope cross-correlations method, indicating the robustness of our array technique. We identify tremor signals with coherent waveforms and deep incidence angles and detect tremor for 44 days among the 134-day study period. The total duration is 1,481-minute, which is 3-6 times more than that detected by the envelope cross-correlations method. In some cases, we observe rapid tremor migration with a speed at the order of 40-50 km/hour that is similar to the speed of fast tremor migration along-dip on narrow streaks in Japan and Cascadia. Our results suggest that dense array techniques are capable of capturing detailed spatiotemporal evolutions of tremor behaviors in southern Taiwan. | |
| dc.description.degree | M.S. | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.uri | http://hdl.handle.net/1853/54251 | |
| dc.language.iso | en_US | |
| dc.publisher | Georgia Institute of Technology | |
| dc.subject | Taiwan | |
| dc.subject | Deep tectonic tremor | |
| dc.subject | Seismic array | |
| dc.title | Detecting deep tectonic tremor in Taiwan using dense arrays | |
| dc.type | Text | |
| dc.type.genre | Thesis | |
| dspace.entity.type | Publication | |
| local.contributor.advisor | Peng, Zhigang | |
| local.contributor.corporatename | School of Earth and Atmospheric Sciences | |
| local.contributor.corporatename | College of Sciences | |
| relation.isAdvisorOfPublication | 7220160b-4bb7-4e32-8ef2-c985b71df08b | |
| relation.isOrgUnitOfPublication | b3e45057-a6e8-4c24-aaaa-fb00c911603e | |
| relation.isOrgUnitOfPublication | 85042be6-2d68-4e07-b384-e1f908fae48a | |
| thesis.degree.level | Masters |