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Slow Slip Events In The Early Part Of The Earthquake Cycle, Nicholas K. Voss, Rocco Malservisi, Timothy H. Dixon, Marino Protti
Slow Slip Events In The Early Part Of The Earthquake Cycle, Nicholas K. Voss, Rocco Malservisi, Timothy H. Dixon, Marino Protti
School of Geosciences Faculty and Staff Publications
In February 2014 a Mw = 7.0 slow slip event (SSE) took place beneath the Nicoya Peninsula, Costa Rica. This event occurred 17 months after the 5 September 2012, Mw = 7.6, earthquake and along the same subduction zone segment, during a period when significant postseismic deformation was ongoing. A second SSE occurred in the middle of 2015, 21 months after the 2014 SSE and 38 months after the earthquake. The recurrence interval for Nicoya SSEs was unchanged by the earthquake. However, the spatial distribution of slip for the 2014 event differed significantly from previous events, having only …
Active Deformation Near The Nicoya Peninsula, Northwestern Costa Rica, Between 1996 And 2010: Interseismic Megathrust Coupling, Lujia Feng, Andrew V. Newman, Marino Protti, Victor Gonzalez, Yan Jiang, Timothy H. Dixon
Active Deformation Near The Nicoya Peninsula, Northwestern Costa Rica, Between 1996 And 2010: Interseismic Megathrust Coupling, Lujia Feng, Andrew V. Newman, Marino Protti, Victor Gonzalez, Yan Jiang, Timothy H. Dixon
School of Geosciences Faculty and Staff Publications
We use campaign and continuous GPS measurements at 49 sites between 1996 and 2010 to describe the long-term active deformation in and near the Nicoya Peninsula, northwestern Costa Rica. The observed deformation reveals partial partitioning of the Cocos-Caribbean oblique convergence into trench-parallel forearc sliver motion and less oblique thrusting on the subduction interface. The northern Costa Rican forearc translates northwestward as a whole ridge block at 11 ± 1 mm/yr relative to the stable Caribbean. The transition from the forearc to the stable Caribbean occurs in a narrow deforming zone of ∼16 km wide. Subduction thrust earthquakes take 2/3 of …
Fore-Arc Motion And Cocos Ridge Collision In Central America, Peter Lafemina, Timothy Dixon, Rob Govers, Edmundo Norabuena, Henry Turner, Armando Saballos, Glen Mattioli, Marino Protti, Wilfried Strauch
Fore-Arc Motion And Cocos Ridge Collision In Central America, Peter Lafemina, Timothy Dixon, Rob Govers, Edmundo Norabuena, Henry Turner, Armando Saballos, Glen Mattioli, Marino Protti, Wilfried Strauch
School of Geosciences Faculty and Staff Publications
We present the first regional surface velocity field for Central America, showing crustal response to interaction of the Cocos and Caribbean plates. Elastic half-space models for interseismic strain accumulation on the dipping subduction plate boundary fit the GPS data well and show strain accumulation offshore and beneath the Nicoya and Osa peninsulas in Costa Rica but not in Nicaragua. Since large subduction zone earthquakes occur in Nicaragua, we suggest that interseismic locking in Nicaragua and some other parts of Central America occurs but is mainly shallow, depth, too far offshore to be detected by our on-land GPS measurements. Our data …