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Seismic Hazard of Honduras
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2000 (English)In: Natural Hazards, ISSN 0921-030X, E-ISSN 1573-0840, Vol. 22, no 1, 49-69 p.Article in journal (Refereed) Published
Abstract [en]

In this paper we have described the proceduresused, input data applied and results achieved in ourefforts to develop seismic hazard maps of Honduras.The probabilistic methodology of Cornell is employed.Numerical calculations were carried out by making useof the computer code SEISRISK III. To examine theimpact of uncertainties in seismic and structuralcharacteristics, the logic tree formalism has beenused. We compiled a de-clustered earthquake cataloguefor the region comprising 1919 earthquakes occurringduring the period from 1963 to 1997. Unified momentmagnitudes were introduced. Definition of aseismotectonic model of the whole region under review,based on geologic, tectonic and seismic information,led to the definition of seven seismogenetic zones forwhich seismic characteristics were determined. Fourdifferent attenuation models were considered. Resultsare expressed in a series of maps of expected PGA for60% and 90% probabilities of nonexceedence in a50-year interval which corresponds to return periodsof 100 and 475 years, respectively. The highest PGAvalues of about 0.4g (90% probability ofnon-exceedence) are expected along the borders withGuatemala and El Salvador.

Place, publisher, year, edition, pages
2000. Vol. 22, no 1, 49-69 p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-90310DOI: 10.1023/A:1008134030510OAI: oai:DiVA.org:uu-90310DiVA: diva2:162618
Available from: 2003-04-17 Created: 2003-04-17 Last updated: 2013-06-12Bibliographically approved
In thesis
1. Earthquake Sources and Hazard in northern Central America
Open this publication in new window or tab >>Earthquake Sources and Hazard in northern Central America
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[es]
Zonas y Amenaza Sísmica en el norte de America Central
Abstract [en]

Northern Central America is a tectonically complex zone defined by its borders with Cocos and North America plates. The Middle America subduction zone and the strike-slip motion along the North America-Caribbean plate boundary, in that order, control most of its deformation. The interaction between the different elements of the studied area is evident from the high seismicity in the region, especially along plate boundaries. Also in the interior of the region, seismicity shows that deformation takes place, though in lesser degree. In a time window of 30 years, three earthquakes with moment magnitude larger than 7 struck northern Central America evincing the need to estimate the seismic hazard for the zone. To tackle the problem, we compiled a catalogue of hypocenters commencing in 1964, defined seismogenic sources and described the evolution of earthquake activity through a Poisson model. Probabilistic seismic hazard (PSH) calculations for the next 50 years were performed. The highest estimate of seismic hazard was obtained for the zone adjacent to the subduction zone. Because of the fundamental importance of demarcating seismogenic sources in the PSH analysis, i.e. defining the seismotectonic model, we extended the catalogue to cover 102 years for the whole northern Central America. We have studied the North America-Caribbean plate boundary in order to refine the fault representation. Different techniques were used, like that of body-waveform modeling, allowing us to limit the extent of depth of faulting to 20 km. The seismic moment tensor was used to estimate the deformation velocities on known tectonic structures, including those of the Honduras depression and borderland faults. Finally, we made use of the Coulomb stress criterion to determine the relation between earthquake occurrence and static stress changes following major earthquakes.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 29 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 834
Geophysics, Northern Central America, Probabilistic Seismic Hazard, Body waveform modeling, Seismic Active Deformation, Earthquake Triggering, Geofysik
National Category
urn:nbn:se:uu:diva-3389 (URN)91-554-5615-4 (ISBN)
Public defence
2003-05-20, Axel Hamber-salen, Geocentrum, Uppsala, 10:00
Available from: 2003-04-17 Created: 2003-04-17 Last updated: 2016-05-13Bibliographically approved

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