The high-magnitude earthquake of 27.2.2010 in southern Central Chile closed one of the two remaining seismic gaps at the South American plate boundary. After the quake of Concepción, the remaining gap in the north of Chile now holds potential for a comparable strong quake and is, thus, moving more and more into the focus of attention.
The GFZ German Research Centre for Geosciences, has been monitoring this gap with the Integrated Plate Boundary Observatory (IPOC) in Chile since 2006. In a festive ceremony on March 15, the Chairman of the Board of the GFZ, Professor Reinhard Huettl, is handing over this Observatory to the Universidad de Chile with the seismological service of Chile and to the Universidad Catolica del Norte.
"Together with our Chilean colleagues and other partners we have developed and operated the IPOC. The transfer to the Chilean Earthquake Service will further strengthen this cooperation" explained Reinhard Huettl in Santiago de Chile. "The observatory will continue to be jointly operated, GFZ will finance the German share. The location for this observatory has obviously been very well selected, as the quake of 27 February shows. This last non-ruptured segment of the Earth's crust off the Chilean west coast is highly interesting for geosciences in the whole world". It is, however, not simply a question of earthquakes. The aim is to continuously measure all processes in connection with the dynamics of this plate boundary.
Approximately one-third of the world-wide seismic energy has discharged during the last century in earthquakes with magnitudes of over M = 8 along the South American-Pacific plate boundary. The repeat-time between two large earthquakes is shorter here than almost anywhere else on our planet.
The IPOC project investigates the area around Iquique on the South American Nazca Plate Boundary. One expects that within the next years a strong to devastating earthquake will occur in this area. Within the framework of investigations, deformation, seismicity, and magnetotelluric fields in the subduction zone will be monitored, i.e. in the periods before, between and possibly also during a quake.
The equipping of the observatory began in close collaboration with the Universidad de Chile (Santiago), the Universidad Católica del Norte (Antofagasta), the IPGP (Paris) and the GFZ (Potsdam). Professor Onno Oncken, Director of the Department "Geodynamics and Geomaterials" at the GFZ (Helmholtz Association) is coordinator of the IPOC activities and explains the construction of the observatory: "Currently the monitoring network consists of 20 seismological stations, equipped with broadband seismometers and acceleration sensors". In order to do justice to the requirements for dissolution and efficiency of the sensors and data capture, special care was given to choosing the exact location. Thus, at each station a lug of approx. 5 m deep was blown into the rock bed, in order to ensure stable site conditions for the monitoring instruments. All seismic installations are equipped with the new-generation GPS-instruments. Seven measuring points were furthermore equipped beyond that with magnetotelluric measuring instruments and serve for the measurement of electric current in the Earth's crust.
Professor Oncken has been leading research on geodynamics in the Andes since 1994. These investigations are not only of geoscientific interest. "Due to the numerous expeditions and measuring campaigns over the years in this subduction zone, the GFZ now holds the densest data set world-wide for such an area" says Onno Oncken. "When we monitor the conditions before, during and after a large quake this serves to help develop a hazard model for this and similar regions.
A strong quake in this region can have consequences for the global economy: the earthquakes here develop through the subduction of the Pacific-floor under South America. The same process also leads to the formation of ore deposits in the Earth's crust. Thus, the largest copper deposit of the world is to be found on the western boundary of the Central Andes. A strong quake could interrupt or even endanger the global supply of copper and lithium.
Illustrations in printable resolution can be found under: http://www.gfz-potsdam.de/portal/gfz/Public+Relations/M40-Bildarchiv/Bildergalerie+Chile-Erdbeben
Further information about the IPOC-Observatory is available under: http://www.ipoc-network.org
Research sheds new light on forces that threaten sensitive coastlines
24.04.2017 | Indiana University
NASA sees the end of ex-Tropical Cyclone 02W
21.04.2017 | NASA/Goddard Space Flight Center
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
24.04.2017 | Life Sciences
24.04.2017 | Earth Sciences
24.04.2017 | Machine Engineering