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  • Articles  (18,334)
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  • 1
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    1 mm-acurate local survey ties over kilometer baselines at McDonald Geodetic Observatory (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-09-06
    Description: The goal for the next generation of terrestrial reference frames (TRF) is to achieve a 1mm and 0.1mm/yr accurate frame realization through the combination of reference station solutions by multi-technique geodetic observatories (GOs), quality benchmarks which are motivated by the user needs from commercial and scientific disciplines that rely on high precision positioning and spatial referencing. A potentially significant source of error in TRF realizations is the inter-system ties between the instruments at multi-technique stations, usually independently measured through ground-based local surveys. In this work, a successful endeavor to satisfy the tie accuracy goals while exceeding the 200m GGOS baseline guidelines is detailed for the McDonald Geodetic Observatory (MGO), located in the Davis Mountains, Texas, USA. MGO consists of a VLBI Geodetic Observing System (VGOS), infrastructure in place for a Space Geodesy Satellite Laser Ranging (SGSLR) telescope, and several GNSS stations spanning a 900m baseline and a 120m elevation change. The results of the local ties between the GNSS stations across the near-kilometer baseline, as measured between their antenna reference points, show sub-mm precision and 1mm accuracy. These results are validated through day to day repeatability across several metrology surveys conducted in 2021 and sub-mm consistency in direct comparisons with baselines derived from GPS monthly averaged solutions. This presentation will report these results, highlighting the novel designs and techniques employed in the procedure, processing, and error-budget analysis. We present framework for assessment of sensitivities of future TRF realizations to ingesting ties of this quality, and present preliminary results.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 2
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    1 week seismological huddle test Fuerstenfeldbruck (2021)
    GFZ Data Services
    Details
    Publication Date: 2021-04-16
    Description: We provide seismological data from a huddle test in Fürstenfeldbruck in August 2019 that was realized by University of Potsdam (PI: Eva Eibl) in collaboration with BGR (PI: Stefanie Donner) and LMU (PI: Felix Bernauer). 5 rotational sensors (blueSeis-3A) and 3 seismometers (Trillium Horizon 120s Nanometrics) were installed on a decoupled basement in a building of the Geophysical Observatory Fürstenfeldbruck. The seismometers were isolated with black foam rubber and white cotton. We recorded passive seismological data for one week and recorded noise, coherent noise sources and the August 29, 2019 ML 3.4 Dettingen earthquake. The aim of the seismic experiment is to compare the performance of rotational sensors and seismometers with respect to different coherent and incoherent noise sources. The noise level, spectral content of the coherent noise and back azimuth of the Dettingen earthquake was further investigated for all sensors using correlation, coherence analysis and probabilistic power spectral densities in Izgi et al. (2021). Waveform data are available from the GEOFON data centre, under network code X3 under CC-BY 4.0 license.
    Language: English
    Type: info:eu-repo/semantics/workingPaper
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  • 3
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    1- D velocity model for the South Western part of Romania. Study case Targu-Jiu area (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-03
    Description: The seismicity of the South Western part of Romania is linked to tectonic deformation being the result of the dextral movements at the contact between the Carpathians Orogen and Moesian Platform. The most notable active faults in this region are the Oravita-Moldova Noua Fault and Cerna-Jiu Fault. The crustal structure of this region was investigated through classical and modern techniques such as refraction and reflection profiling, seismic tomography, joint inversion of dispersion curves, and receiver functions. Targu-Jiu region was characterized before 2023 by sporadic small to moderate earthquakes. A well-investigated seismic sequence was produced in 2011-2012. The recent double-shock occurred in the area in February 2023 (5.2 and 5.7 ML) and was followed by more than 700 aftershocks. In order to estimate an improved 1-D velocity model for this active region, we extracted from the Romanian earthquake bulletins 170 events, recorded by Romanian Seismic Network. The events were selected based on the following criteria: a minimum of 20 recorded phases for each individual earthquake, the RMS location of less than 1 second, and a maximum azimuthal gap of 180 degrees. The region's velocity model and station corrections were accurately determined by minimizing the misfit between the model predictions and arrival times. The VELEST algorithm was run on the selected data, using P and S-wave travel times and the initial velocity models for generating new improved velocity models. We noticed a reduction of up to 40% in RMS location errors for all resulting velocity models.
    Language: English
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  • 4
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    1-month seismological experiment on Etna, Italy in 2019 (2022)
    GFZ Data Services
    Details
    Publication Date: 2023-01-19
    Description: “1-month seismological experiment on Etna, Italy in 2019" is a 1-month seismological experi-ment realized near the Pizzi Deneri Observatory on Etna, Italy, by Eva Eibl and Daniel Vollmer (University of Potsdam) in collaboration with Philippe Jousset from GFZ Potsdam Germany and Gilda Currenti and Graziano Larocca from INGV-OE, Italy. From August to September 2019, we recorded the volcano-seismic events accompanying the volcanic activity using a rotational sensor and a co-located seismometer. The aim of the seismological experiment was to study LP events, VT events and tremor. We used a 3-component broadband seismometer (Nanometrics Trillium Compact 120 s) and a 3-component rotational sensor (iXblue blueSeis-3A) and stored the data on a DataCube and CommunicationCube, respectively. Sensors were installed on the same 35 * 35 * 3 cm3 granitic base plate at about 40 cm depth enclosed by backfilled pyroclastic material to avoid wind noise. The instruments recorded at 200 Hz sampling rate and were located about 2 km from the craters on Etna. The setup was powered using 3 solar panels of 140W each and three batteries of 75Ah each. We oriented the rotational sensor and seismometer using a Quadrans fiber-optical gyrocompass. The Quadrans is not affected by magnetic minerals in the ground and our sensors are hence properly aligned to geographic north. We converted the seismometer data to MSEED using Pyrocko’s Jackseis program and created a catalogs of LP events and VT events that were further investigated in Eibl et al. 2022. Waveform data are available from the GEOFON data centre, under network code ZR.
    Language: English
    Type: info:eu-repo/semantics/workingPaper
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  • 5
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    10 Years Indonesian Tsunami Early Warning System: Experiences, Lessons Learned and Outlook (2017)
    GFZ German Research Centre for Geosciences
    Details
    Publication Date: 2020-02-12
    Description: The German-Indonesian Tsunami Early Warning System (GITEWS) has been established after the devastating Tsunami in the Indian Ocean on December 26, 2004. It became an integral part of the Indonesian Tsunami Early Warning System (InaTEWS) providing sensor networks and core computational components. GITEWS follows an “end-to-end” approach to cover the complete warning chain from rapid hazard detection over decision support to capacity development of communities at risk and the implementation of disaster reduction measures. PROTECTS (Project for Training, Education and Consulting for Tsunami Early Warning Systems) followed GITEWS with its main focus on system refinements, capacity building, and elaborated training measures that covered all aspects of the GITEWS Project. This paper discusses the specific challenges of Tsunami Early Warning in Indonesia, describes recent developments in instrumentation and data analysis and summarizes the system performance over the past 5 years.
    Description: Preface 5Abstract 101. Introduction 102. Instrumentation 132.1 Seismic System 142.2 The GPS-System 182.3 Oceanographic Instruments 203. The Modelling-System 223.1 Source Modelling 233.2 TsunAWI Modelling System 243.3 Mesh Generation 263.4 Simulation System (SIM) 283.5 “On-the-fly”-System easyWave 324. Tsunami Early Warning Decision Support 334.1 The InaTEWS DSS 334.2 Experiences and Enhancements 374.3 Testing and Training Environment 385. System Performance 396. Tsunami Risk Assessment – Linking National Level Early Warning with Local Level Disaster Risk Reduction 436.1 The Approach: From Science to Practical Implementation 436.2 Multi-Scenario Tsunami Hazard Assessment 456.3 High Resolution Tsunami Inundation Modelling for Hazard Assessment 476.4 Exposure and Vulnerability Assessment 486.5 Tsunami Risk Assessment 486.6 Experiences and Enhancements 497. Tsunami Preparedness at Community Level - Experiences from 7 Years of Capacity Development in Indonesia 507.1 The Setting 517.2 Our Experiences 517.3 Project Documentation: TsunamiKit 588. Conclusions 58Acknowledgements 60References 61
    Language: English
    Type: info:eu-repo/semantics/book
    Format: application/pdf
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  • 6
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    10.000 Städte im Klimawandel... Was wissen wir dank GIS? (2014)
    Details
    Publication Date: 2020-02-12
    Language: English
    Type: info:eu-repo/semantics/lecture
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  • 7
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    100 % renewable energy - and beyond - for cities (2010)
    Hamburg : HafenCity Univ. Hamburg | Wuppertal : Wuppertal Institut für Klima, Umwelt, Energie
    Details
    Publication Date: 2019-04-01
    Keywords: ddc:320
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: English
    Type: report , doc-type:report
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  • 8
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    100 kyr fluvial cut-and-fill terrace cycles since the Middle Pleistocene in the southern Central Andes, NW Argentina (2017)
    In:  Earth and Planetary Science Letters
    Details
    Publication Date: 2020-02-12
    Description: Fluvial fill terraces in intermontane basins are valuable geomorphic archives that can record tectonically and/or climatically driven changes of the Earth-surface process system. However, often the preservation of fill terrace sequences is incomplete and/or they may form far away from their source areas, complicating the identification of causal links between forcing mechanisms and landscape response, especially over multi-millennial timescales. The intermontane Toro Basin in the southern Central Andes exhibits at least five generations of fluvial terraces that have been sculpted into several-hundred-meter-thick Quaternary valley-fill conglomerates. New surface-exposure dating using nine cosmogenic 10Be depth profiles reveals the successive abandonment of these terraces with a 100 kyr cyclicity between 75 ±7and 487 ±34ka. Depositional ages of the conglomerates, determined by four 26Al/10Be burial samples and U–Pb zircon ages of three intercalated volcanic ash beds, range from 18 ±141to 936 ±170ka, indicating that there were multiple cut-and-fill episodes. Although the initial onset of aggradation at ∼1 Ma and the overall net incision since ca. 500 ka can be linked to tectonic processes at the narrow basin outlet, the superimposed 100 kyr cycles of aggradation and incision are best explained by eccentricity-driven climate change. Within these cycles, the onset of river incision can be correlated with global cold periods and enhanced humid phases recorded in paleoclimate archives on the adjacent Bolivian Altiplano, whereas deposition occurred mainly during more arid phases on the Altiplano and global interglacial periods. We suggest that enhanced runoff during global cold phases – due to increased regional precipitation rates, reduced evapotranspiration, or both – resulted in an increased sediment-transport capacity in the Toro Basin, which outweighed any possible increases in upstream sediment supply and thus triggered incision. Compared with two nearby basins that record precessional (21-kyr) and long-eccentricity (400-kyr) forcing within sedimentary and geomorphic archives, the recorded cyclicity scales with the square of the drainage basin length.
    Language: English
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  • 9
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    100 Years Exploring Life, 1888-1988: the Marine Biological Laboratory at Woods Hole (2012)
    Jones and Bartlett Publishers | Marine Biological Laboratory (Woods Hole, Mass.)
    Details
    Publication Date: 2023-01-12
    Description: In 1988 the Marine Biological Laboratory celebrated its centennial. In this well-researched, sometimes humorous, always human "biography" of this eclectic institution, historian of science Jane Maienschein catches a glimpse of what it is that has made the MBL so special to all who have spent any time there.
    Description: Arriving in Woods Hole; Living Here; Buildings and Budgets; The Library and Publications; The People; Doing Science; Out of the Lab; Friends and Relatives
    Description: Publications
    Keywords: Marine Biological Laboratory (Woods Hole, Mass.) ; People ; Special Topics Courses ; Organisms ; Governance ; Library ; MBL Courses ; Educational Outreach ; Centers and Programs ; Campus ; Lectures ; Community Events ; Local Area
    Repository Name: Woods Hole Open Access Server
    Language: English
    Type: Text
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  • 10
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    100-kyr fluvial fill terrace cycles since the Middle Pleistocene in the southern Central Andes, Toro Basin, NW Argentina  (2017)
    In:  Geophysical Research Abstracts
    Details
    Publication Date: 2020-06-18
    Language: English
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