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  • 04. Solid Earth::04.06. Seismology::04.06.02. Earthquake interactions and probability  (2)
  • Fisheries
  • Humans
  • Industrial Chemistry
  • Inorganic Chemistry
  • Seismology
  • AGU  (3)
  • International Centre for Trade and Sustainable Development (ICTSD) and IUCN-The World Conservation Union  (1)
  • 2005-2009  (4)
  • 1950-1954
  • 2005  (4)
Collection
Years
  • 2005-2009  (4)
  • 1950-1954
Year
  • 1
    Publication Date: 2017-04-04
    Description: Source and Qp parameters were estimated from the inversion of first arrival P waveform durations of about 300 microearthquakes recorded at a digital seismic network operating in southeastern Sicily. The average risetime and pulse width at each station do not show large differences, allowing us to exclude significant differential attenuation site effects. A first Qp estimate was obtained by applying the classical risetime method, under the assumption of a point-like source time function. In order to investigate the effect of directivity due to the finiteness of seismic sources, new nonlinear relationships, based on a circular crack model rupturing at a constant velocity, were numerically built. These relationships were used to formulate a nonlinear inverse method for retrieving source (radius, dip, and strike of the circular crack) and Qp parameters from the inversion of risetime and pulse width data. The application of the method produced a better fit of the observed data and a Qp value higher than that obtained by applying the risetime method. The discrepancy between the different Q estimates may be due to a trade-off among source dimension and Qp, as we inferred from a test on a subset of low-magnitude events (Ml ≤ 2.5). A good agreement with independent estimates of fault plane solutions, as inferred from P polarities and S polarizations, was found. The estimated stress drops are generally very low (0.1–10 bars). This suggests that the background seismic activity in southeastern Sicily is related to fault segments and/or weakened zones where great stress accumulations are hindered.
    Description: Published
    Description: 1-14
    Description: partially_open
    Keywords: source and Qp parameters ; risetime ; pulse width ; attenuation ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution ; 04. Solid Earth::04.06. Seismology::04.06.02. Earthquake interactions and probability ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 490 bytes
    Format: 654914 bytes
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  • 2
    Publication Date: 2017-04-04
    Description: We investigate southern California seismicity in order to characterize its temporal evolution during the last decades. We analyze the time series composed of the number of events per year and the focal mechanisms of earthquakes since 1933. The results show a statistically significant nonstationarity, with a change that occurred in the 1960s in both time series. The seismicity before the change point is mostly characterized by a strike-slip focal mechanism of San Andreas type; after the 1960s the seismicity appears to show more scattered focal mechanisms and a lower seismicity rate. We provide a possible physical explanation of the significant nonstationarity by modeling the postseismic stress perturbation field induced by the two strongest earthquakes of the last century, the Chile (1960) and Alaska (1964) earthquakes, which both occurred in the 1960s. To first order, the postseismic stress rate seems to be in agreement with the observed changes in seismicity, supporting a causality hypothesis. The model also foretells the future behavior of the trend of southern California seismicity; this forward prediction provides an important opportunity to validate the causal hypothesis of a remote (and long-term) coupling between earthquakes.
    Description: Published
    Description: reserved
    Keywords: lon-term interaction ; post-seismic field ; nonstationarities ; southern california ; 04. Solid Earth::04.06. Seismology::04.06.02. Earthquake interactions and probability
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 339642 bytes
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  • 3
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    International Centre for Trade and Sustainable Development (ICTSD) and IUCN-The World Conservation Union
    Publication Date: 2021-05-19
    Description: The Fisheries, International Trade, and Sustainable Development programme aims to inject both the sustainable development and natural resource management perspectives into the debate on trade and fisheries. The ultimate objective of the programme is to make international trade in fisheries supportive of sustainable development. The programme's main activity will be to convene a series of policy dialogues on fisheries, international trade, and sustainable development which will link processes and actors, and bring together all the different stakeholders' perspectives. Initially the programme aims to facilitate a process in which each stakeholder can move beyond the constraints inherent in his or her position, to enable all participants to step back from particular debates and stand-offs regarding fisheries, trade, and sustainable development-related issues such as subsidies, ecolabelling, or conservation measures. The dialogues, research, and information exchange process will seek to build common understanding and a baseline of shared information, and pave the way for participating stakeholders to seek solutions compatible with the aims of sustainable development by exploring ways to improve resource management while safeguarding the livelihoods of those who depend on fisheries, and ensuring economic growth for developing countries.
    Description: International Centre for Trade and Sustainable Development, IUCN — The World Conservation Union Publications Service Unit
    Description: Published
    Keywords: Sustainable development ; Fisheries ; International trade
    Repository Name: AquaDocs
    Type: Book Section , Non-Refereed
    Format: 84938 bytes
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  • 4
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    AGU
    In:  Washington, D.C., 280 pages, AGU, vol. 81A and 81B, no. 22, pp. 65-70, (ISBN 0-87590-422-X)
    Publication Date: 2005
    Keywords: Seismology ; Seismic arrays ; Data analysis / ~ processing ; Ray seismics ; Synthetic seismograms ; Modelling ; Wave propagation ; Waves ; Earth model, also for more shallow analyses ! ; Physical properties of rocks ; Broad-band
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