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  • 1
    Electronic Resource
    Electronic Resource
    Spectrophotometric study of a hafnium-hematein chelate
    Amsterdam : Elsevier
    Analytica Chimica Acta 66 (1973), S. 377-383 
    Details
    ISSN: 0003-2670
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0003-2670(01)82557-5
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    Paper (German National Licenses)
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  • 2
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    Seismic experiment at the Strokkur Geyser, Iceland, allows to derive a catalogue of over 70,000 eruptions (2019)
    GFZ Data Services
    Details
    Publication Date: 2020-09-02
    Description: Geysers are accessible sites of hot pots, springs and pools that regularly erupt. To investigate the frequency and dynamics of water eruptions we setup a local broadband seismic network at Strokkur geyser, Iceland. The experiment was running for 1 year, from June 2017 to June 2018. Four broadband seismic stations (Nanometrics Trillium Compact Posthole 20s) were buried 30-40 cm deep in the ground at a distance of 39 m (G4, SE), 47 m (G3, SW), 43m (G2, N) and 96 m (G1, NE) from the center of the Strokkur pool geyser. Regular visits and 2-month interval battery replacement allowed to power the stations without solar panels, therewith limiting visibility and site impact. From this data we picked a catalog of 73,466 eruptions, that are statistically further evaluated in Eibl et al. (2020), allowing to distinguish 50,135 single eruptions, and over 20,000 multiplet eruptions (i.e. several eruptions in close succession). The mean waiting time after an eruption at Strokkur linearly increased from 3.7 to 16.4 min for single and multiplets, respectively. This data publications releases the catalog of 73,466 eruptions.
    Language: English
    Type: info:eu-repo/semantics/workingPaper
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  • 3
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    Eruption Interval Monitoring at Strokkur Geyser, Iceland (2020)
    In:  Geophysical Research Letters
    Details
    Publication Date: 2020-12-11
    Description: Geysers are hot springs whose frequency of water eruptions remain poorly understood. We set up a local broadband seismic network for 1 year at Strokkur geyser, Iceland, and developed an unprecedented catalog of 73,466 eruptions. We detected 50,135 single eruptions but find that the geyser is also characterized by sets of up to six eruptions in quick succession. The number of single to sextuple eruptions exponentially decreased, while the mean waiting time after an eruption linearly increased (3.7 to 16.4 min). While secondary eruptions within double to sextuple eruptions have a smaller mean seismic amplitude, the amplitude of the first eruption is comparable for all eruption types. We statistically model the eruption frequency assuming discharges proportional to the eruption multiplicity and a constant probability for subsequent events within a multituple eruption. The waiting time after an eruption is predictable but not the type or amplitude of the next one.
    Language: English
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 4
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    Eruption interval monitoring at Old Faithful, US and Strokkur geyser, Iceland (2019)
    In:  Abstracts
    Details
    Publication Date: 2020-10-28
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 5
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    Implementation of an array and a rotational sensor on Piton de la Fournaise volcano, La Réunion (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-05
    Description: La Réunion, an island in the Indian Ocean, hosts the shield volcano Piton de la Fournaise that recently tends to erupt up to twice per year. The seismic recordings show a great signal diversity including tectonic and volcano-tectonic (VT) earthquakes, eruption tremor, (very) long period events along with a variety of rockfalls.With the aim of testing the rotational sensor performance in comparison with a conventional seismic array, one rotational sensor and an array of seven seismometers were installed within the Enclos-Fouqué caldera. A permanent station of the monitoring network of the Observatoire Volcanologique du Piton de la Fournaise (OVPF) is included in the temporal network. Recordings of (volcano-) seismic signals, detected by the OVPF’s network, are compared to those of the rotational sensor and the array.We calculate the signal-to-noise ratio (SNR), derive the rotation rate using three array stations for array derived rotation (ADR) and compare the backazimuth (BAZ) results using different approaches. The rotational sensor and the array BAZ are furthermore compared to the OVPF’s localizations.Whereas the array BAZ for summit VT events and the rockfall agree with the locations of the OVPF network, the rotational sensor BAZ indicates possible agreement for the rockfall event. Further BAZ results from the rotational sensor are interpreted to be affected by site inhomogeneity. The array stations show higher SNR results than the rotational sensor. As burying of the instruments on site was not possible, the sensors are affected by wind, increasing the noise floor and decreasing the instruments’ sensitivity.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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