000018644 001__ 18644
000018644 005__ 20170118182234.0
000018644 04107 $$aeng
000018644 046__ $$k2017-01-09
000018644 100__ $$aPulido, Nelson
000018644 24500 $$aEstimation of the Tsunami Source of the 1979 Great Tumaco Earthquake Using Tsunami Numerical Modeling

000018644 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018644 260__ $$b
000018644 506__ $$arestricted
000018644 520__ $$2eng$$aThe 1979 Great Tumaco earthquake occurred on 12 December recorded as a surface-wave magnitude of Ms7.7, and moment magnitude Mw8.1 reported in the Harvard CMT Catalog. The epicenter was located 80 km southwest of Tumaco, offshore the Pacific coast of Colombia. This event generated a tsunami that killed more than 220 residents of San Juan island, 60 km north of Tumaco. According to eyewitnesses, few minutes after the event the sea withdrew from the shoreline, then, it returned 10 to 15 minutes later in a succession of three to four cycles of waves. The observed maximum inundation height at this area was approximately 2.5 m. In addition, due to the coseismic crustal subsidence of approximately 1.2 to 1.6 m, streets and houses were inundated over a meter of water depth. Within the framework of the project “Application of State of the Art Technologies to Strengthen Research and Response to Seismic, Volcanic and Tsunami Events, and Enhance Risk Management in Colombia” (JST-JICA SATREPS), the tsunami source model of the 1979 great Tumaco earthquake was estimated from tsunami waveform records and coseismic crustal deformation data. First, a rupture fault of 250 km by 100 km was assumed, and then, to estimate the slip distribution, we divided the tsunami source into 5 subfaults of 50 km by 100 km size. The focal mechanisms of these subfaults are taken from the Harvard CMT solution (strike=30, dip angle=16, and rake=118). We conducted linear tsunami waveform inversion to reproduce the tsunami source using the recorded tsunami wave at Esmeraldas tide gauge station in Ecuador, which is located approximately 75 km south from the epicenter, and three coastal subsidence point in Colombia. The inversion result showed a maximum slip of 2.9 m in the central area of the fault. The estimated seismic moment was calculated as 2.20x1021Nm (Mw=8.16). In addition, the maximum tsunami height estimated from the slip distribution reached up to 8.0 m near San Juan island.

000018644 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018644 653__ $$aThe 1979 Great Tumaco earthquake, Tsunami numerical modeling, Tsunami waveform inversion

000018644 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018644 720__ $$aPulido, Nelson$$iArcila, Mónica$$iSanchez, Ronald$$iMas, Erick$$iKoshimura, Shunichi$$iArreaga, Patricia$$iAdriano, Bruno
000018644 8560_ $$ffischerc@itam.cas.cz
000018644 8564_ $$s1034999$$uhttps://invenio.itam.cas.cz/record/18644/files/1903.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1903.
000018644 962__ $$r16048
000018644 980__ $$aPAPER