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  • Cell & Developmental Biology
  • Inorganic Chemistry
  • Seismology
  • Weizen
  • 2015-2019  (8)
  • 1930-1934
  • 1925-1929
  • 2018  (8)
  • 1
    Publication Date: 2018-03-23
    Description: In recent years it has become accepted that earthquake source can attain significant Non-Double-Couple (NDC) components. Among the driving factors of deviation from normal double-couple (DC) mechanisms there is the opening/closing of fracture networks and the activation of pre-existing faults by pore fluid pressure perturbations. This observation makes the thorough analysis of source mechanism of key importance for the understanding of withdrawal/injection induced seismicity from geothermal and hydrocarbon reservoirs, as well as of water reservoir induced seismicity. In addition to the DC component, seismic moment tensor can be decomposed into isotropic (ISO) and compensated linear vector dipole (CLVD) components. In this study we performed a careful analysis of the seismic moment tensor of induced microseismicity recorded in the Val d'Agri (Southern Apennines, Italy) focusing our attention on the NDC component. The Val d'Agri is a Quaternary extensional basin that hosts the largest onshore European oil field and a water reservoir (Pertusillo Lake impoundment) characterized by severe seasonal level oscillations. Our input data-set includes swarm-type induced micro-seismicity recorded between 2005-2006 by a high-performance network and accurately localized by a reservoir-scale local earthquake tomography. We analyze two different seismicity clusters: (i) a swarm of 69 earthquakes with 0.3 ML 1.8 induced by a wastewater disposal well of the oilfield during the initial daily injection tests (10 days); (ii) 526 earthquakes with -0.2 ML 2.7 induced by seasonal volume changes of the artificial lake. We perform the seismic moment tensor inversion by using HybridMT code. After a very accurate signal-to-noise selection and hand-made picking of P-pulses, we obtain %DC, %ISO, %CLVD for each event. DC and NDC components are analyzed and compared with the spatio-temporal distribution of seismicity, the local stress field, the injection parameters and the water level in the impoundment. We find significant NDC components and abrupt temporal variations in the DC and ISO components that appear linked to the extremely variable parameters of the injection tests into the disposal well.
    Description: Published
    Description: New Orleans, LA
    Description: 2T. Sorgente Sismica
    Keywords: Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 2
    Publication Date: 2019-01-18
    Description: The availability of a large amount of surface geological data and subsurface information gathered by the oil industry, together with seismic and geodetic data, allowed us to define and analyse the active structures in the Val d'Agri area of the southern Apennines. Taking into account that the study of interseismic deformation can be significant to identify locked fault areas that can potentially slip, in this study we present 2D elastoplastic finite-element models to reproduce interseismic characteristics of the study area. This hosts the largest Europe's onshore oil field and is characterised by an active extensional tectonic regime, as inferred from earthquake focal mechanisms and fault slip data from late Quaternary structures. Based on high-quality seismic profiles tied with deep well logs, we constructed a detailed geological section across the study area. Outcropping units are dissected by numerous brittle structures that formed at various stages during the tectonic evolution of the Apennines, while the deep ones are dominated by deeply rooted major faults. The rheological behaviour has been constrained by the reconstruction of the thermal structure of the fold and thrust belt, using available information from the foreland Apulian Platform and from temperature data from a series of wells. Starting from the geological model, we reproduced interseismic deformation by means of finite-element numerical modelling, varying boundary conditions and unlocking different fault segments. Our numerical models provide new insights into the controversial and widely debated active tectonic setting of the Val d'Agri area, confirming the major role played by structural inheritance and reactivation processes. In fact, recent low-magnitude seismicity tends to illuminate fault segments consisting of pre-existing reverse faults reactivated as normal faults in the present-day stress field. These long-lived, mature fault systems occurring in the buried Apulian Platform carbonates (and underlying basement) represent major brittle structures that cumulated displacements of up to a few kilometres over geologic time. As a result of their reactivation within the late Quaternary extensional stress field, these long-lived crustal structures are capable of nucleating also moderate- to large-magnitude earthquakes. The decoupling between deep and shallow structural levels, and the different inherited structures affecting them, explain the apparent contrast between the subdued surface expression of active fault systems and the known occurrence of large magnitude seismic events in the study area, thus reconciling apparently contrasting geological and geophysical constraints.
    Description: Published
    Description: 111-114
    Description: 1T. Deformazione crostale attiva
    Description: N/A or not JCR
    Keywords: Active tectonics ; Fault reactivation ; Stress field ; Seismicity ; Extensional tectonics ; Seismology ; Tectonophysics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 28 Artikel zu Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1980.
    Description: Inhaltsverzeichnis: Journal of Geophysics 48 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0012.pdf"〉The Analysis of Simultaneous Observations of Nighttime Pi Pulsations on an East-West Profile〈/a〉〈br〉 (Baranskiy, L. N., Troitskaya, V. A., Sterlikova, I. V., Gokhberg, M. B., Ivanov, N. A., Khartchenko, I. P., Münch, J. W., Wilhelm, K.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0013.pdf"〉Coordinated Magnetic Observations of Morning Sector Auroral Zone Currents With Triad and the Scandinavian Magnetometer Array: A Case Study〈/a〉〈br〉 (Sulzbacher, H., Baumjohann, W., Potemra, T. A.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0014.pdf"〉K – Ar Age Determinations on Tertiary Volcanic Rocks: V. Siebengebirge, Siebengebirge-Graben〈/a〉〈br〉 (Todt, W., Lippolt, H. J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0015.pdf"〉The Geothermal Anomaly of Landau/Pfalz: An Attempt of Interpretation〈/a〉〈br〉 (Werner, D., Parini, M.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0016.pdf"〉Magnetic and Gravity Investigations of the Dead Sea Rift and Adjacent Areas in Northern Israel〈/a〉〈br〉 (Folkman, Y.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0017.pdf"〉Changes of Structure, Phase Composition and Electric Conductivity Under High-Temperature Oxidation of Titanomagnetites〈/a〉〈br〉 (Kropáček, V., Laštovičková, M.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0018.pdf"〉Maximum Velocity Amplitudes of 〈i〉P〈/i〉 and 〈i〉S〈/i〉 Waves From Filtered Broadband Records〈/a〉〈br〉 (Sitaram, M. V. D, Plešinger, A., Vaněk, J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0019.pdf"〉Comment on: On the Sources of the 12-Month Wave in the 〈i〉an〈/i〉 and 〈i〉as〈/i〉 Geomagnetic Activity Indices〈/a〉〈br〉 (Mayaud, P. N.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0020.pdf"〉Book Reviews〈/a〉〈br〉 (Schopper, J., Hartmann, G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0021.pdf"〉A Late Cretaceous 〈sup〉40〈/sup〉Ar–〈sup〉39〈/sup〉Ar Age for the Lappajärvi Impact Crater, Finland〈/a〉〈br〉 (Jessberger, E. K., Reimold, W. U.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0022.pdf"〉Magnetic Properties of Swiss Flysch〈/a〉〈br〉 (Channell, J., Freeman, R., Heller, F.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0023.pdf"〉Source Parameters of Earthquakes From the Himalayan Region〈/a〉〈br〉 (Upadhyay, S. K., Duda, S. J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0024.pdf"〉Teleseismic Evidence for Velocity Heterogeneity Beneath the Rhenish Massif〈/a〉〈br〉 (Raikes, S.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0025.pdf"〉The Simulation Problem for Broad-Band Seismograms〈/a〉〈br〉 (Seidl, D.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0026.pdf"〉Load-Induced Stresses and Their Relation to the Initial Stress Field〈/a〉〈br〉 (Bock, G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0027.pdf"〉Ground-Based Observations of an Onset of Localized Field-Aligned Currents During Auroral Breakup Around Magnetic Midnight〈/a〉〈br〉 (Opgenoorth, H. J., Pellinen, R. J., Maurer, H., Küppers, F., Heikkila, W. J., Kaila, K. U., Tanskanen, P.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0028.pdf"〉Simultaneous Maxima of Geomagnetic Pulsations and Riometer Absorption on the Afternoon Side of the Auroral Zone〈/a〉〈br〉 (Novikov, Y., Kopytenko, Y., Raspopov, O., Bösinger, T., Kangas, J., Ranta, H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0029.pdf"〉Numerical Investigation of the Spectral Resolving Power of Burg's Maximum Entropy Method〈/a〉〈br〉 (Wenzel, F., Zürn, W.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0030.pdf"〉Errors in Matrix Element Expressions for the Reflectivity Method〈/a〉〈br〉 (Baumgardt, D.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0031.pdf"〉Magnetometer Array Observations of a Giant Pulsation Event〈/a〉〈br〉 (Glaßmeier, K.-H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0032.pdf"〉Palaeomagnetic Secular Variation Curves Extending Back to 13,400 years B.P. Recorded by Sediments Deposited in Lac de Joux, Switzerland〈/a〉〈br〉 (Creer, K., Hogg, T. E., Readman, P. W., Reynaud, C.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0033.pdf"〉Anhysteretic Remanent Magnetization of Small Multidomain Fe〈sub〉3〈/sub〉O〈sub〉4〈/sub〉 Particles Dispersed in Various Concentrations in a Non Magnetic Matrix〈/a〉〈br〉 (Schmidbauer, E., Veitch, R. J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0034.pdf"〉Stirred Remanent Magnetization: A Laboratory Analogue of Post-Depositional Realignment〈/a〉〈br〉 (Tucker, P.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0035.pdf"〉High Precision Measurement of the Frequency of Mode 〈sub〉O〈/sub〉S〈sub〉O〈/sub〉〈/a〉〈br〉 (Zürn, W., Knopoff, L., Rydelek, P. A.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0036.pdf"〉The Solution of Dynamic Problems of Elastic Wave Propagation in Inhomogeneous Media by a Combination of Partial Separation of Variables and Finite-Difference Methods〈/a〉〈br〉 (Alekseev, A. S., Mikhailenko, B. G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0037.pdf"〉A Characteristic Method for Numerical Solution of the Inverse Kinematic Seismic Problems〈/a〉〈br〉 (Romanov, M. E., Alekseev, A. S.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0038.pdf"〉Geomagnetic Induction Studies in Scandinavia〈/a〉〈br〉 (Jones, A. G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0039.pdf"〉Comments on Polarization and Coherence〈/a〉〈br〉 (Samson, J. C.)〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Geophysik ; Auroral Zone Physics ; Broad Band Seismograms ; Earth’s Crust ; Earth’s Mantle ; Electrical Conductivity of Rocks ; Electrical Conductivity of the Earth ; Electromagnetic lnduction in the Earth ; Free Oscillations ; Geochronology ; Geomagnetic Activity ; Geomagnetic Pulsations ; Geomagnetic Time Variations ; Geothermal Anomalies ; Gravity Anomalies ; Himalaya ; Impact Structures ; Induced Seismicity ; Inverse Seismic Problems ; Israel ; Magnetic Anomalies ; Maximum Entropy Method ; Palaeomagnetism ; Polarization Analysis ; Reflectivity Method ; Rheinisches Massiv ; Rock Magnetism ; Rock Physics ; Scandinavia ; Secular Variation ; Seismology ; Siebengebirge ; Stress Field ; Theoretical Seismograms ; FID-GEO-DE-7
    Language: English
    Type: anthology_digi
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  • 4
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 123 (2018): 7824-7849, doi:10.1029/2017JB015346.
    Description: We construct a new seismic model for central and West Antarctica by jointly inverting Rayleigh wave phase and group velocities along with P wave receiver functions. Ambient noise tomography exploiting data from more than 200 seismic stations deployed over the past 18 years is used to construct Rayleigh wave phase and group velocity dispersion maps. Comparison between the ambient noise phase velocity maps with those constructed using teleseismic earthquakes confirms the accuracy of both results. These maps, together with P receiver function waveforms, are used to construct a new 3‐D shear velocity (Vs) model for the crust and uppermost mantle using a Bayesian Monte Carlo algorithm. The new 3‐D seismic model shows the dichotomy of the tectonically active West Antarctica (WANT) and the stable and ancient East Antarctica (EANT). In WANT, the model exhibits a slow uppermost mantle along the Transantarctic Mountains (TAMs) front, interpreted as the thermal effect from Cenozoic rifting. Beneath the southern TAMs, the slow uppermost mantle extends horizontally beneath the traditionally recognized EANT, hypothesized to be associated with lithospheric delamination. Thin crust and lithosphere observed along the Amundsen Sea coast and extending into the interior suggest involvement of these areas in Cenozoic rifting. EANT, with its relatively thick and cold crust and lithosphere marked by high Vs, displays a slower Vs anomaly beneath the Gamburtsev Subglacial Mountains in the uppermost mantle, which we hypothesize may be the signature of a compositionally anomalous body, perhaps remnant from a continental collision.
    Description: National Science Foundation Grant Numbers: PLR‐1142518, PLR‐1246712, PLR 1246151, PLR‐1246416, PLR‐1744883, PLR‐ 1744883
    Description: 2019-03-22
    Keywords: Seismology ; Crust and uppermost mantle ; Ambient noise tomography ; Antarctica ; Transantarctic Mountains ; Gamburtsev Mountains
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 5
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    Woods Hole Oceanographic Institution
    Publication Date: 2022-05-26
    Description: This project was initiated to accomplish the necessary research and documentation of existing seismic techniques and systems for the study of sediments and sedimentary structures in the oceans. In this respect , it is an 'inventory' of methods and techniques for looking at small-scale features or changes in structures lying from 10 to 1000 m beneath the sea floor. It attempts to assess the vertical and lateral resolution capabilities of existing and technically feasible seismic systems. Some of the questions posed are: how closely can we determine vertical variation such as sediment layer thickness and vertical variation with depth; also lateral coherence or its disruption by such agents as facies changes, thinning or thickening, slumping, faulting; the nature of the basement structure, its areal coherence, velocity structure and associated anomalies?
    Description: Prepared for the Sandia Laboratories under Contract 13-9944.
    Keywords: Seismology ; Ocean bottom
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 6
    Publication Date: 2022-05-26
    Description: Also published as: Journal of Geophysical Research 86 (1981): 3783- 3790
    Description: We present preliminary hypocenter determinations for 52 earthquakes recorded by a large multiinstitutional network of ocean bottom seismometers and ocean bottom hydrophones in the Orozco Fracture Zone in the eastern Pacific during late February to mid-March 1979. The network was deployed as pan of the Rivera Ocean Seismic Experiment, also known as Project ROSE. The Orozco Fracture Zone is physiographically complex, and the pattern of microeanhquake hypocenters at least partly reflects this complexity. All of the well-located epicenters lie within the active transform fault segment of the fracture zone. About lialf of the recorded earthquakes were aligned along a narrow trough that extends eastward from the northern rise crest intersection in the approximate direction of the Cocos-Pacific relative plate motion; these events appear to be characterized by strike-slip faulting. The second major group of activity occurred in the central portion of the transform fault; the microearthquakes in this group do not display a preferred alignment parallel to the direction of spreading, and several are not obviously associated with distinct topographic features. Hypocentral depth was well resolved for many of the earthquakes reported here. Nominal depths range from 0 to 17 km below the seafloor.
    Description: Prepared for the Office of Naval Research under Contract N00014-79-C-0071; NR 083-004.
    Keywords: Natural disasters ; Seismology
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 7
    Publication Date: 2022-05-26
    Description: Also published as: Journal of Geophysical Research 84 (1979): 5487-5496
    Description: This geophysical survey of an approximate 1° square covers Mesozoic magnetic anomalies M0, M2, and M4 south of Bermuda. Bathymetry, magnetics, seismic reflection profiling, and seismic refraction data are presented. The isochron trend within the survey area at magnetic anomaly M4 time is 025°. Two left lateral fracture zones exist: the southern fracture zone has an offset of 〈10 km at M4 time and 33 km at M0 time. The northern fracture zone has an offset of 37 km at M4 time and 26 km at M0 time. These changes in offset are accounted for by asymmetric spreading, an 11° change in trend of anomaly M0 relative to M4, and by M0 time, growth of a small right lateral fracture zone. Seismic refraction data provide poor control on the shallow crustal structure but suggest the presence of significant lateral inhomogeneities within layer 2.
    Description: Prepared for the Office of Naval Research under Contract N00014-74-C-0262; NR 083-004.
    Keywords: Submarine geology ; Seismology
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 8
    Publication Date: 2022-05-26
    Description: Author Posting. © The Author(s), 2017. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in Tectonophysics 721 (2017): 143-150, doi:10.1016/j.tecto.2017.10.003.
    Description: The 2006 Mw 7.8 Java earthquake was a tsunami earthquake, exhibiting frequency-dependent seismic radiation along strike. High-frequency global back-projection results suggest two distinct rupture stages. The first stage lasted ~65 s with a rupture speed of ~1.2 km/s, while the second stage lasted from ~65 to 150 s with a rupture speed of ~2.7 km/s. High-frequency radiators resolved with back-projection during the second stage spatially correlate with splay fault traces mapped from residual free-air gravity anomalies. These splay faults also colocate with a major tsunami source associated with the earthquake inferred from tsunami first-crest back-propagation simulation. These correlations suggest that the splay faults may have been reactivated during the Java earthquake, as has been proposed for other tsunamigenic earthquakes, such as the 1944 Mw 8.1 Tonankai earthquake in the Nankai Trough.
    Description: W.F. is currently supported by the Postdoctoral Scholar Program at the Woods Hole Oceanographic Institution, with funding provided by the Weston Howland Jr. Postdoctoral Scholarship.
    Keywords: Earthquake ; Tsunami ; Back-projection ; Splay faults ; Java ; Seismology
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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