The Seismicity of Central America

Ambraseys, N. N.; Adams, R. D.

doi:10.1142/p209

Cited by 25 publications

(44 citation statements)

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“…This can be easily proved considering ancient (Erhan et al 2003;Volkan 2011), historical (Ambraseys et al 1983;Ambraseys 1988), and instrumentally recorded events of different magnitudes which are distributed over the entire territory. Studying the historical earthquakes shows that this region had experienced several seismic events of magnitude 7 and greater, i.e., M7.0+ in the past (Ambraseys and Adams 1986;Finkel 1987, 1995;Ambraseys et al 1983) (Table 1).…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of the M8 algorithm to predict M7+ earthquakes in Turkey

2014

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The M8 algorithm is one of the most reliable intermediate-term middle-range earthquake prediction algorithms. The present study evaluates the ability of the M8 algorithm and its modified versions for predicting major events (M7+) in Turkey. Thirty different algorithms were developed by changing the radius of circle of investigation (CI) and the lower magnitude cutoff of the M8 algorithm. These modified algorithms were executed all over the territory of Turkey, and the results were evaluated using the error diagram. Each modified algorithm was executed for consecutive half-year intervals over a specified period of time. Subsequently, the seismic catalog was updated, and failures-to-predict ratio and the fraction of alarm were considered. Results showed that the location of areas of alarm change gradually over consecutive intervals, and no sudden changes can be observed. In addition, the annual changes of areas of alarm are not random and follow a pattern. This study also showed that the modified algorithm having a three to six annual average of events and a 393-km CI radius is an efficient algorithm for predicting the future seismic events in Turkey. This algorithm predicted six out of six target events, retrospectively, with a confidence level of 96.4 %. According to the obtained results, it will be possible to rely on this modified algorithm to predict near future earthquakes of Turkey. Furthermore, this study proves that it is possible to alter the M8 algorithm for being used in regional studies.

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Section: Introductionmentioning

confidence: 99%

Performance evaluation of the M8 algorithm to predict M7+ earthquakes in Turkey

2014

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“…Seismic studies presented by Ambraseys and Adams (1986) and Abdalla et al (1997b) Abdalla et al 1997) the most. The source has been active recently: an earthquake of Richter magnitude of about 5.5 was felt in Khartoum on the morning of August 1, 1993.…”

Section: Tectonic Features and Seismicity Of Sudanmentioning

confidence: 91%

Site Response and Earthquake Design Spectra for Central Khartoum, Sudan

Mohamedzein

Abdalla

Abdelwahab

2006

Bull Earthquake Eng

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Khartoum, the capital of Sudan, is located at the confluence of White and Blue Niles. The city is heavily populated. Central Khartoum with its high-rise buildings is the center of governmental and business activities and is located on a strip adjacent to the Blue Nile. Geological and geotechnical data indicate that the subsoil conditions at Central Khartoum are characterized by alluvial deposits underlain by Nubian Sandstone at a depth of 25 m. The alluvial deposits, locally known as Gezira formations, consist of clays grading into silt and sand with depth. Macro seismic zonation of Sudan and its vicinities, developed by the authors, gave the ground acceleration at the bedrock surface. The effect of alluvial deposits in Central Khartoum on propagation of seismic motion parameters to the ground surface is investigated in this study. Correlations are proposed for pertinent cyclic soil properties such as shear modulus, damping, and shear wave velocity. The Equivalent-Linear Earthquake Response Analyses (EERA) Model was used to study the effect of local soil conditions on ground-motion parameters. In the absence of strong-motion records in Khartoum, available worldwide strong-motion records are used. Plots showing the time histories of ground motion parameters at the ground surface are obtained. The results indicate amplification of ground motion of up to 4.93. The predicted fundamental period of soils is about 0.5 s which is typical for these types of soils. The maximum spectral acceleration varied from 0.76 to 0.95 g. For design purposes, a response spectrum curve is proposed.

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“…A historical earthquake catalogue which compiled data from historical sources from 1615 to 1969 has been published by Ambraseys and Adams (1986), and instrumental records of earth tremors and earthquakes from 1973 to 1997 have been published by Amponsah (2002).…”

Section: Earthquake Cataloguementioning

confidence: 99%

“…All historical earthquakes which were reported only with ''felt'' and which had a certain radius of perceptibility were assigned an intensity of IV. The earthquake catalogue is of two parts: the historical earthquakes from 1615 to 1969 were published by Ambraseys and Adams (1986), with earthquake parameters taken from historical sources (Junner, 1941;Quaah, 1980) and a second part with the Amponsah (2002). No records are available from 1975 to 1976 and from 1980 to 1986.…”

Section: Content Of the Data Cataloguementioning

confidence: 99%