A5002265041- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Seismic Waves and Analysis
- Seismology and Earthquake Studies
- Geological and Tectonic Studies in Latin America
- Seismic Imaging and Inversion Techniques
- Earthquake Detection and Analysis
- Geophysics and Sensor Technology
- Geological and Geophysical Studies
- Landslides and related hazards
- Reservoir Engineering and Simulation Methods
- GNSS positioning and interference
- Geological and Geophysical Studies Worldwide
- Geotechnical and Geomechanical Engineering
- Inertial Sensor and Navigation
- Geochemistry and Geologic Mapping
- Geophysics and Gravity Measurements
- Soil, Finite Element Methods
- Structural Health Monitoring Techniques
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Drilling and Well Engineering
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Underwater Acoustics Research
University of Concepción
2014-2024
GFZ Helmholtz Centre for Geosciences
2020
Japan External Trade Organization
2006
University of Puerto Rico-Mayaguez
1996
University of Puerto Rico System
1996
University of Memphis
1991
University of California, Santa Cruz
1990
University of Chile
1982
We observed vertically displaced coastal and river markers after the 27 February 2010 Chilean earthquake [moment magnitude (Mw) 8.8]. Land-level changes range between 2.5 -1 meters, evident along an approximately 500-kilometers-long segment identified here as maximum length of coseismic rupture. A hinge line located 120 kilometers from trench separates uplifted areas, to west, subsided regions. simple elastic dislocation model fits these observations well; parameters give a similar seismic...
We analyze short‐period PKP precursor wave trains recorded at Global Digital Seismograph Network stations in the distance range 120° < Δ 140° to infer nature of inhomogeneities near core‐mantle boundary. Travel times and particle motions are consistent with predictions single‐scattered waves CMB. The dominant frequencies around 1 Hz. regions best sampled beneath Indonesia, North America, Central Africa, South America. Based on first‐order scattering theory, characteristics number spectrum...
We use traveltime data of local earthquakes and controlled sources observed by a large, temporary, amphibious seismic network to reveal the anatomy southcentral Chilean subduction zone (37–39°S) between trench magmatic arc. At this location giant 1960 earthquake ( M = 9.5) nucleated ruptured almost 1000 km megathrust. For three‐dimensional tomographic inversion we used 17,148 P wave 10,049 S arrival time readings from 439 94 shots. The resolution images was explored analyzing model matrix...
We installed a dense, amphibious, temporary seismological network to study the seismicity and structure of seismogenic zone in southern Chile between 37° 39°S, nucleation area great 1960 earthquake. 213 local earthquakes with 14.754 onset times were used for simultaneous inversion 1‐D velocity model precise earthquake locations. Relocated artificial shots suggest an accuracy hypocenter about 1 km (horizontally) 500 m (vertically). Crustal events along trench‐parallel transverse,...
In 2005 an amphibious seismic network was deployed on the Chilean forearc between 41.75°S and 43.25°S. 364 local events were observed in a 11‐month period. A subset of P S arrival times inverted for hypocentral coordinates, 1‐D velocity structure station delays. Main activity occurred predominantly belt parallel to coast Chiloé Island depth range 12–30 km presumably related plate interface. The 30° inclination shallow part Wadati‐Benioff zone is similar observations further north indicating...
This study focuses on the present‐day deformation mechanisms of south central Chile margin, at transition zone between two megathrust earthquake segments defined from historical data: Valdivia and Concepción sectors. New GPS data finite‐element models with complex geometries constrained by geophysical are presented to gain insight into forearc kinematics address role upper plate faults contemporary deformation. vectors heterogeneously distributed in domains that follow these segments. We...
Understanding the processes behind subduction‐related hazards is an important responsibility and major challenge for Earth sciences. Few areas demonstrate this as clearly south‐central Chile, where some of largest earthquakes in human history have occurred. We present first observation local seismicity Villarrica region (39°–40°S), based on a temporary network 55 stations installed from Chilean coast into Argentinian back‐arc one year. While consistent with national catalog (SSN), our...
Abstract We document the arrival of seismic energy in core shadow zone up to large distances beyond 150° more than 100 s prior phases. Numerical simulations transport an established heterogeneity model show that scattering throughout entire mantle explains these observations. Diffraction at core‐mantle boundary is unlikely our 1–2 Hz frequency band and not required indicating misleading terminology with reference P diff for scattered ∗ ‐energy. Records largest deep earthquakes low‐noise...
The results of a seismic refraction profile across the Southern Andes at 39°S from Chilean Pacific coast to Argentinean Neuquén Basin are presented here.A 2-D crustal velocity model was derived traveltime forward modeling correlated phases on shot-sections shotpoints in Ocean and Main Cordillera.The is characterized by lower average velocities fore-arc than arc.A typical continental Moho not observed under fore-arc, arc could only be inferred teleseismic receiver function studies.The oceanic...
Abstract We present a method to determine the polarization of body waves from three-component, high-frequency data and examples its application. The is based on principal component approach. One advantage this approach that state can be determined for small time windows compared with predominant period wave. This particularly useful identifying converted within crust. stability result analyzed synthetic cases by adding simultaneous arrivals random noise. works well both local in detection...
On 2007 April 21, a Mw = 6.2 earthquake shook the Aysén Fjord, Southern Chile in an unprecedented episode for this region characterized by low seismicity. The area is intersected Liquiñe-Ofqui Fault System (LOFS), +1000-km-long strike-slip fault that absorbs part of oblique convergence motion between Nazca and South America plates. To study aftershock sequence main event, we installed seismic network 15 stations period nearly 7 months. We seismogenic structure zone calculating minimum 1-D...