HR: 0800h
AN: G11A-0768    [Abstracts]
TI: Present day Fault Kinematics of Northern Baja California, Mexico
AU: * Malservisi, R
EM: rmalservisi@rsmas.miami.edu
AF: University of Miami RSMAS MGG, 4600 Rickenbacker Cswy, Miami, FL 33149 United States
AU: La Femina, P C
EM: plafemina@rsmas.miami.edu
AF: University of Miami RSMAS MGG, 4600 Rickenbacker Cswy, Miami, FL 33149 United States
AU: Dixon, T H
EM: tdixon@rsmas.miami.edu
AF: University of Miami RSMAS MGG, 4600 Rickenbacker Cswy, Miami, FL 33149 United States
AU: Fletcher, J
EM: jfletche@cicese.mx
AF: CICESE Departamento de Geologia, Km 107 Carr. Tijuana - Ensenada, Ensenada, BC 22860 Mexico
AU: Suarez-Vidal, F
EM: fsuarez@cicese.mx
AF: CICESE Departamento de Geologia, Km 107 Carr. Tijuana - Ensenada, Ensenada, BC 22860 Mexico
AU: Furlong, K P
EM: kevin@geodyn.psu.edu
AF: Penn State University Dept of Geosciences, 542 Deike Building, University Park, PA 18602 United States
AB: Although the major plate boundary between the North American and Pacific plates runs through the Gulf of California, the northern portion of Baja California accomodates a significant amount of plate motion. Partitioning of slip among the different faults, as well as the behavior of blocks between the faults, is still unclear. The interpretation of the surface velocity field measured by campaign GPS is highly model dependent. In particular the amount of slip accomodated by each fault can be quite sensitive to assumption about rheological properties, fault geometry, and stage in the earthquake cycle. We recently collected new campaign GPS measurements in the region that improve our knowledge of Northern Baja Kinematics. Here we present the new velocity field. We analyze the effect of different modeling assumptions on slip partitioning along the different faults using finite element models. In particular we show that it is important for the models to incorporate geological observation such as earthquake cycle.
DE: 8120 Dynamics of lithosphere and mantle--general
DE: 8150 Plate boundary--general (3040)
DE: 8155 Plate motions--general
DE: 1206 Crustal movements--interplate (8155)
DE: 1236 Rheology of the lithosphere and mantle (8160)
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting