56 documents found in 205ms
# 11
Passarelli, Luigi • Heryandoko, Nova • Muzli • Rasmid • Zimmer, Martin • (et. al.)
Abstract: The Halmahera island belongs to the North Moluccas province (Maluku Utara), Indonesia. This K-shaped island is located in the eastern part of the Moluccas Sea, the only active arc-arc collision complex on the Earth. The western arm of the K forms a volcanic arc due to the former subduction of the Moluccas Sea plate underneath Halmahera. The region is characterized by intense seismic activity at crustal, intermediate depth, and along the subducting plate. At crustal level the Halmahera seismicity along the two eastern arms of the K show strike-slip faulting style. In November 2015 a localized intense and energetic seismic activity started around Jailolo volcano in the West Halmahera Regency. The seismic sequence intermittently lasted until February 2016 and hundreds of events were felt by the population and several buildings were destroyed and damaged by the shaking. The largest shocks of the sequence have been located by global agencies (GEOFON and GCMT) showing normal faulting style. The temporal evolution of the seismicity seems to be more swarm-like type activity instead of mainshock-aftershock sequence. In spring 2016 a research project has been funded by the German's Humanitarian Aid program in collaboration with BMKG, Indonesia, with the goal of understanding the origin of the intense seismic activity and the related hazard. In summer 2016 we instrumented the area with a dense seismic network composed of 29 short period and 6 broad-band seismometers. The instruments deployment aims at characterizing the seismicity of the Jailolo region in relationship with the 2015-2016 seismic activity. The network will help to understand the seismo-tectonic of the area and the relation between seismicity and the volcanic activity at Jailolo volcano and possible link with the 2015-2016 swarm. Should the seismic activity intensify as in November 2015, we can record it and narrow down the underlying physical mechanisms. Waveform data are available from the GEOFON data centre, under network code 7G, and are embargoed until the end of 2021.
# 12
Walter, Thomas • Gaete, Ayleen • Mikulla, Stefan • Kujawa, Christian • Salzer, Jacqueline • (et. al.)
Abstract: The network consists of 5 stations covering the volcanic cone flanks. These stations were operative during one year with the final purpose of detect likely changes in the seismic activity of Lascar after the 2014 Iquique earthquake. Waveform data are available from the GEOFON data centre, under network code 8E, and are embargoed until 001 2019.
# 13
Walter, Thomas • Gaete, Ayleen • Lara, Luis • Mikulla, Stefan • Kujawa, Christian • (et. al.)
Abstract: The network consistes in 6 stations surronding the fumarole field at Lastarria volcano. These stations were operative during one month with the final purpose of detect changes in the hydrothermal system triggered by passing of seismic waves produced by artificial explosions. Waveform data are available from the GEOFON data centre, under network code 2G, and are embargoed until 001 2019.
# 14
Schurr, Bernd • Yuan, Xiaohui • Haberland, Christian • Mechie, James • Kufner, Sofia-Katerina
Abstract: The TIPTIMON seismic deployment in Afghanistan aimed to study the seismotectonics of the Hindu Kush and the Tajik-Afghan basin. Within this network 8 seismic stations were deployed between 2013 to 2014 to study shallow and intermediate depth seismicity. TIPTIMON (Tien Shan-Pamir Monitoring) is a research programme funded by the German Federal Ministry of Education and Research (BMBF) within the CAME Programme (Central Asia - Monsoon dynamics and Geo-ecosystems). All stations were equipped with MARK L-4C-3D geophones and DSS CUBE recorders, continuously recording with 100 samples per second. Waveform data is available from the GEOFON data centre, under network code 6C, and is embargoed until Oct 2018.
# 15
Schurr, Bernd • Yuan, Xiaohui • Haberland, Christian • Mechie, James • Kufner, Sofia-Katerina
Abstract: The TIPTIMON seismic deployment in Tajikistan aimed to study the seismotectonics of the western Pamir and Tajik-Afghan basin. Within this network 25 seismic stations were deployed between 2012 to 2014 to study shallow and intermediate depth seismicity. TIPTIMON (Tien Shan-Pamir Monitoring) is a research programme funded by the German Federal Ministry of Education and Research (BMBF) within the CAME Programme (Central Asia - Monsoon dynamics and Geo-ecosystems). All stations recorded continuously with 100 samples per second and were equipped with EDL (EarthData PR6-24) recorders and broadband seismometers. Waveform data is available from the GEOFON data centre, under network code 5C, and is embargoed until April 2018.
# 16
Asch, G. • Mohsen, A. • Bräuer, B. • Hofstetter, R. • Jaser, D. • (et. al.)
Abstract: For the seismology part of DESIRE 38 short period stations and 27 broadband stations were deployed in the area of the southern Dead Sea basin in Israel and Jordan. The deployment was covering the basin as well as the shoulders of the basin. The average spacing was 2.5 km in Jordan and 4.5 km in Israel. Due to problems with vandalism and thefts in some locations in Israel so we lost some stations and had to dismantle all stations in unguarded areas. For the redeployment of these stations in June 2007 the study area was enlarged to the North and to the South. This network configuration made it appropriate to observe the local microearthquake activities as well as teleseismic events. The (micro)seismicity, its distribution and its properties were an important subject of the investigation. Furthermore the seismic events can be used to study the deeper structure of the DSB, which can be supported by investigations using teleseismic events. Waveform data is available from the GEOFON data centre, under network code Z4, and is fully open.
# 17
Qian, Hui • Mechie, James
Abstract: From June 2012 to November 2013, the Chinese Academy of Geological Sciences (CAGS) together with the Deutsches GeoForschungsZentrum Potsdam (GFZ) operated an array of 80 broadband seismic stations in a 300 km by 150 km area straddling the Longmenshan fault zone around the epicentre of the Wenchuan earthquake. Since the occurrence of the Ms 8.0 Wenchuan earthquake which ruptured about 300 km of the Longmenshan fault zone in May 2008, this region has attracted the attention of many Earth scientists. Since the earthquake the Wenchuan Earthquake Fault Scientific Drilling (WFSD) Project has drilled several holes up to 3 km depth. The main purpose of the present array of seismological stations is to investigate the deep structure of the region surrounding the epicentre of the Wenchuan earthquake. While the array was operating the Ms 6.6 Lushan earthquake occurred in April 2013 at the SW edge of the array. Waveform data is available from the GEOFON data centre, under network code 2F, and is embargoed until DEC 2017.
# 18
Wilde-Piórko, Monika • Geissler, Wolfram H. • Plomerová, Jaroslava • Knapmeyer-Endrun, Brigitte • Grad, Marek • (et. al.)
Abstract: The Teisseyre-Tornquist Zone (TTZ) as part of the Trans-European Suture Zone (TESZ) is one of the most prominent suture zones in Europe separating the young Palaeozoic platform from the much older Precambrian East European craton. The knowledge of deep structure of the TESZ is very important for the understanding of various tectonic processes in Europe. The PASSEQ 2006-2008 seismic experiment was performed thanks to a big international effort of 17 institutions from 10 countries. A total of 139 three-component temporary short-period and 49 temporary broadband seismic stations provided continuous recordings between May 2006 and June 2008 with the main period of recordings during 2007, in an array about 1200 km long and 400 km wide running from Germany through the Czech Republic and Poland to Lithuania. The average spacing between all stations was about 60 km, attaining about 20 km in the central part. The configuration of the seismic network was a compromise among needs of different seismic methods. The dense central profile allows the use of modern passive 2-D imaging techniques, while the distribution of broadband sensors was designed for surface wave and receiver function studies of the upper mantle down to the transition zone in a wide frequency range. Waveform data is fully open, with network code 7E.
# 19
Roessler, Dirk • Passarelli, Luigi • Govoni, Aladino • Bautz, Ralf • Dahm, Torsten • (et. al.)
Abstract: The temporary Extended Pollino Seismic Experiment (FDSN network code Y4) monitored the earthquake swarm in the Pollino Range region, Italy, between September 2014 and April 2015. The experiment followed the Pollino Seismic Experiment, 2012-2014 (network code: 4A) [1] in the same area, further enhancing the detection and analysis capabilities there. It was part of a collaborative effort made by the German Research Centre for Geoscience (GFZ) and the Istituto Nazionale di Geofisica e Vulcanologia (INGV) within the CCMP-Pompei, FEFI and NERA projects. The Pollino Range region is located at the transition from the Southern Apennines chain to the Calabrian arc. Striking a volume of about 20x20x15 km, the swarm started in October 2010, culminated in a Mw=5.2 on 25 October 2012 and has continued since with a variable rate of activity. The area represents a seismic gap as there are no documented historical M>6 earthquakes during the last thousand years. The tectonic structures of the area are poorly known. The Y4 network consisted of 19 stations including 14 broadband and five short-period instruments. All instruments were provided by the Geophysical Instrument Pool Potsdam (GIPP) and the CCMP-Pompei project at GFZ and INGV. They were complemented by another four temporary IV stations installed by INGV. The short-period stations had Mark L-4C3D sensors with EDR digitizers. The broadband stations were equipped with STS2.5 seismometers and RefTek RT130S digitizers or Güralp CMG-ESP or Güralp CMG-40T seismometers and EDR digitizers. Eleven broadband (CSA0 to CSA10) were installed in a small-aperture detection array in the west of the range. The other 8 stations (broadband: CSB, CSE, CSD0 and short period: CSF, CSG, CSH, CSI, CSK) formed a network in the swarm area. The array and the network stations recorded in continuous mode at 200 Hz. The sensors were buried in the ground at 0.5 m depth except for CSB, CSE and CSD0 which were installed on the surface. High-precision station coordinates were obtained by using differential GPS measurements. The data have been used to analyze the earthquakes and seismogenetic structures and to discern the characteristics of the swarm sequence. Waveform data will be fully open after April 2017. [1] Pollino Seismic Experiment, 2012-2014, doi:10.14470/9N904956
# 20
Asch, Guenter • Tilmann, Frederik • Schurr, Bernd • Ryberg, Trond
Abstract: The integrated plate boundary in Chile (IPOC) combines 15 broadband stations with strong-motion sensors, GPS, strain sensors and magneto-telluric stations. The Chilean subduction zone setting provides a high background rate of seismicity (crustal, intermediate depth, and plate interface) in a region with exceptionally low ambient noise, particularly at higher frequencies. We have deployed seismic mini-arrays in the vicinity of IPOC stations PB02 and PB07, and installed a third array to the east of these stations near the village of Quillagua, such that all three arrays form a triangle. Each array has 10 elements and an aperture in the km range. The study area lies just to the north of the northern boundary of the rupture area of the Tocopilla earthquake of 2007 (Mw=7.7) and just above or slightly to the east of the downdip limit of plate interface seismicity. Installing the mini-arrays in the area of the existing IPOC has the following advantages: * Independent knowledge of background structure and seismicity from existing and ongoing studies. * Should any transients or other unusual signals be found in the array data, we can look for anomalous signals in geodetic and MT recordings, which will help to narrow down possible underlying mechanisms.
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