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  • 1
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    1-month seismological experiment on Etna, Italy in 2019 (2022)
    GFZ Data Services
    Details
    Publication Date: 2022-06-21
    Description: Abstract
    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.
    Keywords: Broadband seismic waveforms ; Seismic monitoring ; temporary local seismic network ; Rotational seismometer ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 VOLCANIC ACTIVITY ; In Situ/Laboratory Instruments 〉 Magnetic/Motion Sensors 〉 Seismometers ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS
    Type: Other , Seismic Network
    Format: ~60G
    Format: SEED data
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    DATA GFZ
  • 2
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    10Be content s of late Cenozoic sediments from ODP Leg 117 (1991)
    PANGAEA
    In:  Supplement to: Beets, Christiaan J; Klaver, G T; Kroon, Dick; van der Borg, Klaas; de Jong, Arie F M (1991): 10Be contents of late Cenozoic sediments from Sites 720, 722, and 728 in the western Arabian Sea. In: Prell, WL; Niitsuma, N; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 117, 455-458, https://doi.org/10.2973/odp.proc.sr.117.164.1991
    Details
    Publication Date: 2024-01-09
    Description: This paper is a comparative study of the variation in 10Be content of different late Cenozoic sedimentary environments recovered during ODP Leg 117. The Oman Margin site, Hole 728A, with overlying high-productivity cells, the pelagic Owen Ridge site, Hole 722A, and the Indus Fan site, Hole 720A, each display a specific 10Be distribution with time. Differences in scavenging intensity and upwelling in the water column, must account for the variations in the initial 10Be input into the sediments from Holes 728A and 722A, whereas differences in sediment character and sedimentation rate can explain the variances between Holes 722A, 728A, and 720A.
    Keywords: 117-720A; 117-722A; 117-728A; Arabian Sea; DRILL; Drilling/drill rig; Joides Resolution; Leg117; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 3
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    10Be data for sediments from DSDP Leg 56 and ODP Leg 170 (2002)
    PANGAEA
    In:  Supplement to: Morris, Julie; Valentine, R; Harrison, T (2002): 10Be imaging of sediment accretion and subduction along the northeast Japan and Costa Rica convergent margins. Geology, 30(1), 59-62, https://doi.org/10.1130/0091-7613(2002)030%3C0059:BIOSAA%3E2.0.CO;2
    Details
    Publication Date: 2024-01-09
    Description: Sediment accretion and subduction at convergent margins play an important role in the nature of hazardous interplate seismicity (the seismogenic zone) and the subduction recycling of volatiles and continentally derived materials to the Earth's mantle. Identifying and quantifying sediment accretion, essential for a complete mass balance across the margin, can be difficult. Seismic images do not define the processes by which a prism was built, and cored sediments may show disturbed magnetostratigraphy and sparse biostratigraphy. This contribution reports the first use of cosmogenic 10Be depth profiles to define the origin and structural evolution of forearc sedimentary prisms. Biostratigraphy and 10Be model ages generally are in good agreement for sediments drilled at Deep Sea Drilling Project Site 434 in the Japan forearc, and support an origin by imbricate thrusting for the upper section. Forearc sediments from Ocean Drilling Program Site 1040 in Costa Rica lack good fossil or paleomagnetic age control above the decollement. Low and homogeneous 10Be concentrations show that the prism sediments are older than 3-4 Ma, and that the prism is either a paleoaccretionary prism or it formed largely from slump deposits of apron sediments. Low 10Be in Costa Rican lavas and the absence of frontal accretion imply deeper sediment underplating or subduction erosion.
    Keywords: 170-1040B; 170-1040C; 56-434; 56-436; Costa Rica subduction complex, North Pacific Ocean; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg170; Leg56; North Pacific/RIDGE; North Pacific/TRENCH; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 4
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    10Be records of sediment cores from high northern latitudes (1994)
    PANGAEA
    In:  Supplement to: Eisenhauer, Anton; Spielhagen, Robert F; Frank, Martin; Hentzschel, Günter; Mangini, Augusto; Kubik, Peter W; Dittrich-Hannen, Beate; Billen, T (1994): 10Be records of sediment cores from high northern latitudes: Implications for environmental and climatic changes. Earth and Planetary Science Letters, 124(1-4), 171-184, https://doi.org/10.1016/0012-821X(94)00069-7
    Details
    Publication Date: 2024-02-02
    Description: The 10Be records of four sediment cores forming a transect from the Norwegian Sea at 70°N (core 23059) via the Fram Strait (core 23235) to the Arctic Ocean at 86°N (cores 1533 and 1524) were measured at a high depth resolution. Although the material in all the cores was controlled by different sedimentological regimes, the 10Be records of these cores were superimposed by glacial/interglacial changes in the sedimentary environment. Core sections with high 10Be concentrations ( 〉1 * 10**9 at/g) are related to interglacial stages and core sections with low10Be concentrations ( 〈0.5 * 10**9 at/g) are related to glacial stages. Climatic transitions (e.g., Termination II, 5/6) are marked by drastic changes in the 10Be concentrations of up to one order of magnitude. The average 10Be concentrations for each climatic stage show an inverse relationship to their corresponding sedimentation rates, indicating that the 10Be records are the result of dilution with more or less terrigenous ice-rafted material. However, there are strong changes in the 10Be fluxes (e.g., Termination II) into the sediments which may also account for the observed oscillations. Most likely, both processes affected the 10Be records equally, amplifying the contrast between lower (glacials) and higher (interglacials) 10Be concentrations. The sharp contrast of high and low 10Be concentrations at climatic stage boundaries are an independent proxy for climatic and sedimentary change in the Nordic Seas and can be applied for stratigraphic dating (10Be stratigraphy) of sediment cores from the northern North Atlantic and the Arctic Ocean.
    Keywords: Antarctic Ocean; ARK-II/4; ARK-IV/3; AWI_Paleo; Fram Strait; Giant box corer; GIK21524-2 PS11/364-2; GIK21533-3 PS11/412; GIK23059-1; GIK23235-1 PS05/422; GKG; Gravity corer (Kiel type); KAL; Kasten corer; M2/2; Meteor (1986); Norwegian Sea; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS05; PS11; PS1235-1; PS1524-2; PS1533-3; Quaternary Environment of the Eurasian North; QUEEN; SL; Svalbard
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 5
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    10Be/9Be-based chronostratigraphy of ODP Hole 181-1121B from the Southwest Pacific Ocean (2004)
    PANGAEA
    In:  Supplement to: Graham, I J; Carter, Robert M; Ditchburn, R G; Zondervan, A (2004): Chronostratigraphy of ODP 181, Site 1121 sediment core (Southwest Pacific Ocean), using 10Be/9Be dating of entrapped ferromanganese nodules. Marine Geology, 205(1-4), 227-247, https://doi.org/10.1016/S0025-3227(04)00025-8
    Details
    Publication Date: 2024-01-09
    Description: A 10Be/9Be-based chronostratigraphy has been determined for ODP 181, Site 1121 sediment core, recovered from the foot of the Campbell Plateau, Southwest Pacific Ocean. This core was drilled through the Campbell 'skin drift' in ca. 4500 m water depth on the mid-western margin of the extensive Campbell Nodule Field, beneath the flow of the major cold-water Deep Western Boundary Current (DWBC). In the absence of detailed biostratigraphy, beryllium isotopes have provided essential time information to allow palaeo-environmental interpretation to be undertaken on the upper 7 m of the core. Measured 10Be/9Be ratios of sediment, and of ferromanganese nodules entrapped in the sediment, decrease systematically with depth in the core, in accordance with radioactive decay. However, the 10Be/9Be data diverge from ca. 3 m below the seafloor (mbsf) to the top of the core, giving rise to several possible geochronological models. The preferred model assumes that the measured 10Be/9Be ratios of the nodule rims reflect initial 10Be/9Be ratios equivalent to contemporary seawater, and that these can be used to derive the true age of the sediment where the nodules occur. The nodule rim ages can be then used to interpret the sediment 10Be/9Be data, which indicate an overall age to ca. 7 mbsf of ca. 17.5 Ma. The derived chronology is consistent with diatom biostratigraphy, which indicates an age of 2.2-3.6 Ma at 1 mbsf. Calculated sedimentation rates range from 8 to 95 cm m.y.**-1, with an overall rate to 7 mbsf of ca. 39 cm m.y.**-1. The lowest rates generally coincide with the occurrence of entrapped nodules, and reflect periods of increased bottom current flow causing net sediment loss. Growth rates of individual nodules decrease towards the top of the sediment core, similar to the observed decrease in growth rate from core to rim of seafloor nodules from the Campbell Nodule Field. This may be related to an overall increase in the vigour of the DWBC from ca. 10 Ma to the present.
    Keywords: 181-1121; COMPCORE; Composite Core; Joides Resolution; Leg181; Ocean Drilling Program; ODP; South Pacific Ocean
    Type: Dataset
    Format: application/zip, 7 datasets
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  • 6
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    14C activity of Antarctic lichens (1992)
    PANGAEA
    In:  Supplement to: Willkomm, Horst; Bölter, Manfred; Kappen, Ludger (1992): Age estimation of Antarctic Macrolichens by radiocarbon measurements. Polarforschung, 61(2/3), 103-112, hdl:10013/epic.29685.d001
    Details
    Publication Date: 2023-08-26
    Description: By the nuclear bomb tests during the 1950s and early 1960s, the radiocarbon content of the atmospheric CO, on the Southern Hemisphere rose within a few years from 98 to 162% of the standard recent value and then dropped to 122% (at the end of 1984). This rapid fluctuation was used to determine the lifetime of five species of lichens collected in the beginning of 1985 in the maritime Antarctic. Under the assumption that Lichens assimilate each year carbon at the same rate and that carbon once fixed at least in main branches never will be exchanged later on. The age of mature thalli of Caioplaco regalis, Ramalino tetebrata and Ustiea antarctica was determined to 32 years, while U, aurantiaco-atra and Himantormia lugubris gave an age of ca. 38 years and ca. 60 years, respectively.
    Keywords: Arctowski_Meteo; Arctowski-Station; Henryk Arctowski Polish Ant. Station; King George Island, Antarctic Peninsula; Long-term meteorological data; STAT; Station
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 7
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    2-year seismological experiment near Fagradalsfjall, Reykjanes peninsula in 2021/22 (2022)
    GFZ Data Services
    Details
    Publication Date: 2022-05-03
    Description: Abstract
    Description: "2-year seismological experiment near Fagradalsfjall, Reykjanes peninsula in 2021/22" is a two-year seismological experiment realized near the eruptive site at Fagradalsfjall on the Reykjanes peninsula, Iceland, by Eva Eibl (University of Potsdam) in collaboration with Gylfi P. Hersir, Egill Á. Gudnason and Friðgeir Pétursson from ISOR Iceland. From March to September 2021 an effusive, basaltic eruption happened in Geldingadalir near mount Fagradalsfjall on the Reykjanes peninsula. The aim of the seismic experiment was to monitor volcano-seismic signals such as LP events, VT events and tremor, before, during and after the eruption from 14 March 2021 to August 2022. We used two broadband seismometers (Nanometrics Trillium Compact 120 s) and two rotational sensors (iXblue blueSeis-3A) and stored the data on DataCubes and CommunicationCubes, respectively. Sensors were until mid-June installed on the surface and shielded from wind using a bucket. From mid-June they were buried 40cm deep in the ground at about 2 km from the eruptive vent. At any given time, at least one station recorded the seismic signals caused by the eruption. Waveform data are available from the GEOFON data centre, under network code 9F.
    Keywords: Broadband seismic waveforms ; Seismic monitoring ; temporary local seismic network ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 VOLCANIC ACTIVITY ; In Situ/Laboratory Instruments 〉 Magnetic/Motion Sensors 〉 Seismometers ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS
    Type: Other , Seismic Network
    Format: ~600G
    Format: SEED data
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    DATA GFZ
  • 8
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    2D geodynamic subduction model of the Central Andes (2022)
    GFZ Data Services
    Details
    Publication Date: 2022-10-21
    Description: Abstract
    Description: The Central Andes (~21°S) is a subduction-type orogeny formed in the last ~50 Ma from the subduction of the Nazca oceanic plate beneath the South American continental plate. However, the most important phases of deformation occur in the last 20 Ma. Pulses of shortening have led to the sudden growth of the by the Altiplano-Puna plateau. Previous studies have provided insights on the importance of various mechanisms on the overall shortening such as the weakening of the overriding plate from crustal eclogitization and delamination, or the importance of a relatively high friction at the subduction interface, and weak sediments in foreland. However none of them has addressed the mechanism behind these shortening pulses yet. Therefore, we built a series of high resolution 2D visco-plastic subduction models using the ASPECT geodynamic code, in which the oceanic plate is buoyancy-driven and the velocity of the continent is prescribed. We have also implemented a realistic geometry for the south American plate at ~30 Ma. We propose a new plausible mechanism (buckling and steepening of the slab) as the cause of these pulses. The buckling leads to the blockage of the trench. Consequently, the difference of velocity between the South American plate and the trench is accommodated by shortening. The data presented here includes the parameters files, for the reference model (S1) and the following alternative simulations: models with variation of the friction at the subduction interface (S2a-c), a model without eclogitization of the lower crust (S3) and a model with higher thermal conductivity of the upper crust (S4). Additionally, this publication includes the initial composition and thermal state of the lithosphere used for the models and a Readme file that gives all the instructions to run them.
    Keywords: Andes ; geodynamics ; subduction ; Buckling ; Altiplano ; Puna ; shortening ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 PLATE TECTONICS 〉 PLATE BOUNDARIES ; EARTH SCIENCE SERVICES 〉 MODELS 〉 GEOLOGIC/TECTONIC/PALEOCLIMATE MODELS
    Type: Model , Model
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  • 9
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    3-D seismic interpretation with deep learning: a set of Python tutorials (2021)
    GFZ Data Services
    Details
    Publication Date: 2022-02-24
    Description: Abstract
    Description: Here we are sharing our code, tutorials and examples used to interpret geological structures (e.g. faults, salt bodies and horizones) in 2-D and/or 3-D seismic reflection data using deep learning. The repository is organised in a series of tutorials (Jupyter notebooks) with increasing degree of difficulty. We show step-by-step how to: (1) load seismic data, (2) train a model and (3) apply the model to map different geological structures. You can find a few visual examples on our poster and more technical details in our preprint.
    Keywords: Seismic reflection data ; Seismic interpretation ; Machine learning ; Deep learning ; Geophysics ; EARTH SCIENCE ; EARTH SCIENCE 〉 OCEANS 〉 MARINE GEOPHYSICS ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS
    Type: Software , Software
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  • 10
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    39Ar/40Ar ratios of whole rock samples from ODP Hole 107-655B and 107-651A (Table 1) (1990)
    PANGAEA
    In:  Supplement to: Feraud, Gilbert (1990): 39Ar-40Ar Analysis on Basaltic Lava Series of Vavilov Basin, Tyrrhenian Sea (Ocean Drilling Program, Leg 107, Holes 655B and 651A). In: Kastens, KA; Mascle, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 107, 93-97, https://doi.org/10.2973/odp.proc.sr.107.138.1990
    Details
    Publication Date: 2024-01-09
    Description: Six whole rocks from the basaltic lava series drilled in the Vavilov basin have been analyzed by 39Ar-40Ar stepwise heating method. One sample from the upper part of the Hole 655B basement gave a plateau-age at 4.3 ± 0.3 Ma whereas the other ones showed disturbed age spectra caused by alteration processes. The weighted averages of ages measured at low and intermediate temperatures on these five samples are concordant (1) one to each other and (2) with independent estimates deduced from paleontological and paleomagnetical arguments. Ages of 4.3 ± 0.3 Ma and from 3 to 2.6 Ma may represent reasonable estimates of the crystallization ages of the basaltic lava series of the Holes 655B and 651A, respectively. These ages must be taken with caution because they correspond to argon released from secondary phases characterized by low argon retention.
    Keywords: 107-651A; 107-655B; Age, dated; Age, dated standard deviation; Argon-37/Argon-39; Argon-39; Argon-40/Argon-39; Contamination; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg107; Ocean Drilling Program; ODP; Sample code/label; Temperature, technical; Tirreno Sea
    Type: Dataset
    Format: text/tab-separated-values, 546 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
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