Other language confidence: 0.8845007906167301
The largest earthquakes occur at tectonic plate boundaries in subduction zones, known as subduction megathrusts. The subduction megathrust in northern Chile (19°-23°S) has been monitored since 2007 by the Integrated Plate Boundary Observatory Chile (IPOC) network, which includes an array of 11 long-period magnetotelluric (MT) sites to infer changes in deep fluid distribution. Here we present time-series data from 2007-2016, the interval encompassing the precursory and foreshock seismic sequences of the 2007 Mw 7.7 Tocopilla and 2014 Mw 8.1 Iquique earthquakes, an interval that also includes a dozen slow slip events. The time series for this data publication represent a subset of the MT data recorded within the framework of the IPOC project. The dataset comprises 5-component MT data from 5 sites with sampling rate of 8 Hz and 1 Hz. This data publication (10.5880/GIPP-MT.200699.1) encompasses a detailed report in pdf format with a description of the project, information on the experimental setup, data collection, instrumentation used, recording configuration and data quality. The folder structure and content of the data repository are described in detail in Ritter et al. (2019). Time-series data are provided in EMERALD format (Ritter et al., 2015).
Surface deformation in the continental interior, away from active tectonic margins, is enigmatic, with the underlying mechanisms responsible not fully understood. Therefore, it is considered an open and important question in continental dynamics. The Hangai Dome, central Mongolia, is a natural laboratory to explore this question. It is a high-elevation, low-relief, intra-continental region within the Mongolian plateau. It is located between the Siberian and North China cratons and lies within the Central Asian Orogenic Belt. Central Mongolia has a complex tectonic history that is not well understood. It consists of several lithotectonic units that have influenced the formation and development of the region. The Hangai region has a long history of volcanic activity, including Cenozoic episodes of intraplate volcanism, which occurred as recently as the Holocene. It is characterized by dispersed, low-volume, alkali basaltic volcanism. Furthermore, major fault systems bound the Hangai region and large parts of central Mongolia. The processes and driving mechanisms responsible for creating the Hangai region remain largely unexplained. Therefore, we aim to collect high-resolution magnetotelluric data to image the electrical conductivity structure of the crust and upper mantle beneath the Hangai Dome in order to better understand the mechanisms responsible for intracontinental uplift and intraplate volcanism in this unique region. To achieve this objective a project was created, titled “Crust-mantle interactions beneath the Hangai Mountains in western Mongolia - Insights from 3-D magnetotelluric studies and 4-D thermo-mechanical modelling”. The first phase of the project was completed in 2016. Magnetotelluric data were recorded across the Hangai Dome in a grid (~400 by ~200 km), with a nominal site spacing of 50 km. Broadband measurements were acquired at each grid node and, additionally, long period measurements were acquired along two profiles. This data report provides details on the data collection, the measurement site locations, the instrumentation, and the data format. This data publication (https://doi.org/10.5880/GIPP-MT.201613.1) encompasses a detailed report in pdf format with a description of the project, information on the experimental setup, data collection, instrumentation used, recording configuration and data quality. The folder structure and content of the data repository are described in detail in Ritter et al. (2019). Time-series data are provided in EMERALD format (Ritter et al., 2015).
The South African Karoo Basin, which is known for its potentially shale gas bearing formations, was the target of an extensive research programme launched by the Nelson Mandela University, South Africa. The aim of this project was to obtain a fundamental understanding of the geology, petrology and hydrology of the sedimentary layers. In 2014, Magnetotelluric (MT) measurements were conducted in the Eastern Karoo Basin to image the electrical conductivity structure of the shallow subsurface and to develop a three-dimensional (3D) model. Previous studies by Weckmann et al. (2007a, b) and Branch et al. (2007) identified the potentially shale gas bearing Whitehill Formation as an electrically conductive sub-horizontal layer, which covers large parts of the Karoo Basin. The increased interest in future shale gas exploration raised concerns regarding the potential impact on aquifers in this water scarce and fragile environment. Since the electrical conductivity is sensitive to fluids, imaging both, the black shale horizon and the deep aquifer system in this region was the ultimate goal of the MT study. Our field experiment is designed to serve as a baseline study before any activity regarding shale gas exploitation commenced. With high resolution 2D and regional 3D inversion and forward models several aquifers, the Whitehill formation and the possible source region of the Beattie Magnetic Anomaly could be mapped.This data publication (10.5880/GIPP-MT.201423.1) encompasses a detailed report in pdf format with a description of the project, information on the experimental setup, data collection, instrumentation used, recording configuration and data quality. The folder structure and content of the data repository are described in detail in Ritter et al. (2019). Time-series data are provided in EMERALD format (Ritter et al., 2015).
Although the exploitation of strategic important mineral deposits is currently feasible down to a depth of ~ 1000 m, the extension of ore deposits in Germany is poorly known. The BMBF funded DESMEX (Deep Electromagnetic Sounding for Mineral Exploration) project focuses on the development of an electromagnetic exploration system which can be used for the exploration of mineral resources for depths down to 1000 m. The main focus lies in the exploration of potential mineral deposits in Germany. Ore mineralization leads to an increase of electrical conductivity in the host rock. Therefore, innovative methods are developed, which are able to image zones of high conductivity with respect to the intended exploration depth and deliver insights in the geometry of the ore deposit. In order to obtain an high coverage as well as an high resolution, air borne and ground based methods are combined in a semi airborne controlled source EM (CSEM) concept. This concept was tested in an old antimony mining area in eastern Thuringia. In the framework of DESMEX, the University of Cologne carried out ground based (long offset) transient-electromagnetic (LOTEM) measurements. Within the LOTEM validation study, an independent resistivity model of the survey area was derived, which serves as reference model for the semi airborne concept and is integrated in a final mineral deposition model. This data publication (https://doi.org/10.5880/GIPP-MT.201716.1) encompasses a detailed report in pdf format with a description of the project, information on the experimental setup, data collection, instrumentation used, recording configuration and data quality. The folder structure and content of the data repository are described in detail in Ritter et al. (2019). Time-series data are provided in EMERALD format (Ritter et al., 2015).
Although the exploitation of strategic important mineral deposits is currently feasible down to a depth of ~ 1000 m, the extension of ore deposits in Germany is poorly known. The BMBF funded DESMEX (Deep Electromagnetic Sounding for Mineral Exploration) project focuses on the development of an electromagnetic exploration system which can be used for the exploration of mineral resources for depths down to 1000 m. The main focus lies in the exploration of potential mineral deposits in Germany. Ore mineralization leads to an increase of electrical conductivity in the host rock. Therefore, innovative methods are developed, which are able to image zones of high conductivity with respect to the intended exploration depth and deliver insights in the geometry of the ore deposit. In order to obtain an high coverage as well as an high resolution, air borne and ground based methods are combined in a semi airborne controlled source EM (CSEM) concept. This concept was tested in an old antimony mining area in eastern Thuringia. In the framework of DESMEX, the University of Cologne carried out ground based (long offset) transient-electromagnetic (LOTEM) measurements. Within the LOTEM validation study, an independent resistivity model of the survey area was derived, which serves as reference model for the semi airborne concept and is integrated in a final mineral deposition model. This data publication (https://doi.org/10.5880/GIPP-MT.201608.1) encompasses a detailed report in pdf format with a description of the project, information on the experimental setup, data collection, instrumentation used, recording configuration and data quality. The folder structure and content of the data repository are described in detail in Ritter et al. (2019). Time-series data are provided in EMERALD format (Ritter et al., 2015).
The West Bohemian Massif as part of the geodynamically active European Cenozoic Rift System is characterised by ongoing magmatic processes in the intra-continental lithospheric mantle. A series of phenomena such as massive degassing of CO2 and repeated earthquake swarms make the Eger Rift a unique target area for European intra-continental geo-scientific research. The ICDP project "Drilling the Eger Rift" was funded to study the field of earthquake-fluid-rock-biosphere interaction. In the framework of this ICDP project, magnetotelluric (MT) experiments have been conducted to image the subsurface distribution of the electrical conductivity down to depths of several tens of kilometres as the electrical conductivity is particularly sensitive to the presence of high-conductive phases such as aqueous fluids, partial melts or metallic compounds. Based on recent MT experiments in 2015/2016, Munoz et al. (2018) presented 2D images of the electrical conductivity structure along a NS profile across the Eger Rift. It reveals a conductive channel at the earthquake swarm region that extend from the lower crust to the surface forming a pathway for fluids up to the region of the mofettes. A second conductive channel is present in the south of the model. Due to the given station setup along a profile, the resulting 2D inversion allows ambiguous interpretations of this feature. As 3D inversion is required to distinguish between the different interpretations, we conducted another MT field experiment at the end of 2018. This data publication (10.5880/GIPP-MT. 201810 .1) encompasses a detailed report in pdf format with a description of the project, information on the experimental setup, data collection, instrumentation used, recording configuration and data quality. The folder structure and content of the data repository are described in detail in Ritter et al. (2019). Time-series data are provided in EMERALD format (Ritter et al., 2015).
Magnetotellurics (MT) is a geophysical deep sounding tool that can help decipher the deep hydrology and geology of Antarctica, in concert with more established and already applied geophysical methods, such as seismology, gravity, and magnetics. Electrical conductivity is an important physical parameter to identify properties of rocks and, perhaps more importantly, constituents within, such as fluids or mineralisation.The unique conditions of Antarctica, which is largely covered with ice cause technical issues, particularly with the electric field recordings, as highly resistive snow and ice at surface of Antarctica hampers contact of the E-field sensors (telluric electrodes) with the ground. The project was a feasibility study to address this principal problem and to test modified MT equipment of the Geophysical Instrument Pool Potsdam (GIPP) in the vicinity of the Neumayer Station III (NMIII) on the Ekström Ice Shelfon.This data publication encompasses a detailed report in .pdf format with a description of the project, information on the experimental setup, data collection, instrumentation used, recording configuration and data quality. The folder structure and content of the data repository are described in detail in Ritter et al. (2019). Time-series data are provided in EMERALD format (Ritter et al., 2015).
Assess of the feasibility of magnetotelluric measurements for geothermal exploration in northern Bavaria despite of the high level of cultural electromagnetic noise.This data publication encompasses a detailed report in pdf format with a description of the project, information on the experimental setup, data collection, instrumentation used, recording configuration and data quality. The folder structure and content of the data repository are described in detail in Ritter et al. (2019). Time-series data are provided in EMERALD format (Ritter et al., 2015).
The Integrated Geophysical Exploration Technologies for Deep Fractured Geothermal Systems project (I-GET) was aimed at developing an innovative strategy for geophysical exploration, particularly to exploit the full potential of seismic and electromagnetic exploration methods in detecting permeable zones and fluid bearing fractures.The proposed geothermal exploration approach was applied in selected European geothermal systems with different geological and thermodynamic reservoir characteristics: in Italy (high enthalpy reservoir in metamorphic rocks), in Iceland (high enthalpy reservoir in volcanic rocks) and in Germany and Poland (low to middle enthalpy reservoir in sedimentary rocks).The Groß Schönebeck in-situ geothermal laboratory, located 40 km north of Berlin in northeastern Germany, is a key site for testing the geothermal potential of deep sedimentary basins. The target reservoir is located in Lower Permian sandstones and volcanic strata, which host deep aquifers throughout the Northeast German Basin (NEGB). The laboratory consists of two 4.3-km-deep boreholes.The electrical conductivity of the subsurface is a very important parameter for characterizing geothermal systems as hot and mineralized (saline) fluids of deep aquifers can be imaged as regions of high electrical conductivity. In the first phase of the I-GET project, carried out in summer 2006, MT data was recorded at 55 stations along a 40-km long profile. In order to reduce the effect of the cultural noise, 4 remote reference stations located at distances of about 100 km from the profile were used. This profile is spatially coincident with a seismic tomography profile (Bauer et al., 2010). The main objective of the geophysical site characterization experiments was to derive combined electrical conductivity and P- and S-velocity tomographic models for a joint interpretation in high resolution.The data are provided in EMERALD format (Ritter et al., 2015). The folder structure and content is described in detail in Ritter et al., 2019. The project specific description is available in the associated data description file including information on the experimental setup and data collection, the instrumentation, recording configuration and data processing. Scientific outcomes of this project were published by Muñoz et al., (2010a, 2010b).
Surface deformation in the continental interior, away from active tectonic margins, is enigmatic, with the underlying mechanisms responsible not fully understood. Therefore, it is considered an open and important question in continental dynamics. The Hangai Dome, central Mongolia, is an ideal location to explore this because it is a high-elevation, low-relief, intra-continental region within the Mongolian plateau, between the Siberian and North China cratons, and within the Central Asian Orogenic Belt. The tectonic history of Central Mongolia is not well understood. It consists of several lithotectonic units that have influenced the formation and development of the region. The Hangai region has had intraplate volcanism throughout the Cenozoic, including as recently as the Holocene, in addition to older Mesozoic volcanic activity. It is characterized by dispersed, low-volume, alkali basaltic volcanism. Furthermore, major shear fault systems bound the Hangai region and central Mongolia. Our objective is to collect high-resolution magnetotelluric data to image the electrical resistivity structure of the crust and upper mantle beneath the Hangai Dome in order to better understand the processes and mechanisms responsible for intracontinental uplift and intraplate volcanism in this unique region, helping shed light on the Hangai region. Building on the successful first phase of the project (2016), a second phase was completed in 2017. We expanded our magnetotelluric measurement array: to the west along four new profiles; to the south, across the Gobi-Altai mountains; to the north, across the Bulnay fault segments; filling in the previous profiles for denser site spacing. This new grid of data is ~650 km long and ~400 km wide, with a nominal site spacing of 50 km for broadband measurements. In addition, we completed a small profile across the Tariat/Khorgo region and a reconnaissance profile in Zavkhan. This data report provides details on the data collection, the measurement site locations, the instrumentation, and the data format. This data publication (10.5880/GIPP-MT.201706.1) encompasses a detailed report in pdf format with a description of the project, information on the experimental setup, data collection, instrumentation used, recording configuration and data quality. The folder structure and content of the data repository are described in detail in Ritter et al. (2019). Time-series data are provided in EMERALD format (Ritter et al., 2015).
| Organisation | Count |
|---|---|
| Wissenschaft | 10 |
| Type | Count |
|---|---|
| unbekannt | 10 |
| License | Count |
|---|---|
| Offen | 10 |
| Language | Count |
|---|---|
| Englisch | 10 |
| Resource type | Count |
|---|---|
| Keine | 10 |
| Topic | Count |
|---|---|
| Boden | 10 |
| Lebewesen und Lebensräume | 10 |
| Luft | 2 |
| Mensch und Umwelt | 10 |
| Wasser | 1 |
| Weitere | 10 |