Seismic hazard of the Iberian Peninsula: evaluation with kernel functions

Crespo, M. J.; Martínez, Felipe I.; Martí, J.

doi:10.5194/nhess-14-1309-2014

Cited by 9 publications

(6 citation statements)

References 40 publications

(51 reference statements)

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“…While the DSHA evaluates the worst-case scenario and presents the values of ground motion related to the worst-case scenario, the PSHA allows determining the exceedance rates of the specified ground motion at a desired time. Therefore, a direct comparison between DSHA and PSHA results does not make sense, but the regional trend over the large zones of maximum values (Gorringe, Planicia Horseshoe, Coral Patch areas, in the Atlantic sector, and Arzew Faults Algerian zone, in the Mediterranean), minimum and intermediate PGA values is similar to that obtained in this work with DSHA despite the maps obtained with PSHA methods (UPM- IGN, 2017 andPoggi et al, 2020), with a different zonation (Woessner et al, 2015), or with a nonzoned method (Crespo et al, 2014). DSHA, unlike other SHA methods, is not affected by the uncertainty of the seismic parameters, as handled by the method, which can be very relevant in areas where a complete comprehensive fault-specific catalogue of faults and their activity is not available for a robust estimation.…”

Section: Discussionsupporting

confidence: 73%

“…uniformly distributed throughout the study area and for which six previous studies have published their calculated values (Table 1) of the PGA hazard (Crespo et al, 2014;Rivas Medina, 2014;Salgado Gálvez et al, 2015;Woessner et al, 2015;IGN-UPM, 2017;Poggi et al, 2020).…”

Section: Sensitivity and Comparative Analysesmentioning

confidence: 99%

“…Table 1: Estimated PGA values (in g) presented from various authors (Annex VI in IGN-UPM (2017), NAF (Poggi et al 2020), EHSM13-SHARE (Woessner et al, 2015), Crespo et al (2014), Rivas Medina (2014 and CIMNE (Salgado Gálvez et al, 2015)) in each city used to control the results obtained from the DSHA calculation in the study area. Incorporating uncertainty in the ground motion models, this work has evaluated the effect on the DSHA of choosing two values of 16% and 2% of the desired exceedance probability above the mean, which translates into an effect on the spatial and statistical distribution of the PGA map values, which have also been analysed from a descriptive statistical perspective.…”

Section: Sensitivity and Comparative Analysesmentioning

confidence: 99%

See 2 more Smart Citations

Review article: Deterministic seismic hazard assessment of the area comprised between west Gulf of Cádiz and east Alboran Sea

Beltré¹,

Paredes

Llorente

2023

Preprint

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Abstract. The convergence zone of the NE-SW complex comprising the Gulf of Cádiz and the Alboran Sea, at the Eurasian-Nubian plate boundary, is frequently affected by seismic activity, caused by submarine long-strike strike-slip fault systems and arcuate fold-thrust systems found in the region. This has resulted in moderate to high magnitude earthquakes, including tsunamigenic earthquakes, and the area has also experienced tsunamis due to major earthquakes and gravitational landslides. This study carries out a Seismic Hazard Analysis, for bedrock conditions, of the marine area between the W of the Gulf of Cádiz and the E of the Alboran Sea in the Ibero-Maghrebian region, based on a deterministic approach, considering areal seismogenic sources. For the estimation of the seismic hazard, a Visual Basic script based on Excel has been used, which has been improved. The results obtained show that the most probable Peak Ground Acceleration (PGA) ranges from 0.2 to 0.4 g, although it can reach up to 1.0 g in certain areas. These results highlight the need for a detailed study of the distribution of seismic hazard in submarine areas, given the significant values of accelerations that can occur. This work is the first comprehensive deterministic seismic hazard assessment carried out in the Ibero-Maghrebian region and aims to take a first step to promote seismic hazard studies in marine areas, whose results can provide relevant information given the implications of earthquakes in the genesis of other natural hazards such as tsunamis and submarine landslides.

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Section: Discussionsupporting

confidence: 73%

Section: Sensitivity and Comparative Analysesmentioning

confidence: 99%

Section: Sensitivity and Comparative Analysesmentioning

confidence: 99%

See 1 more Smart Citation

Review article: Deterministic seismic hazard assessment of the area comprised between west Gulf of Cádiz and east Alboran Sea

Beltré¹,

Paredes

Llorente

2023

Preprint

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“…In the case of the non-Poissonian model, we used the zoning-free method Kergrid suggested originally by Woo (1996), where seismicity is described in a grid. Until now it has not been widely used (see also Molina et al, 2001), but recently has gained some interest (Ornthammarath et al, 2008;Crespo et al, 2014;Ashish et al, 2016). The fundamental principle is well known: namely a more direct use of the earthquake catalog rather than using parameterized and simplified recurrence model parameters.…”

Section: Source Modelsmentioning

confidence: 99%

Seismic Hazard for Cuba: A New Approach

Álvarez

Lindholm

Villalón

2016

Bulletin of the Seismological Society of America

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A new seismic hazard study for Cuba is presented in terms of maps and uniform hazard spectra (UHS). An earthquake catalog from 1502 to 2012 was prepared for the region 16°-24°N and 67°-86°W, and was homogenized to M w and cleaned for aftershocks and foreshocks. A 16-arm logic-tree computation corresponding to four source branches and four ground-motion prediction equations (GMPEs) was conducted (using only published GMPE relations due to a lack of local strongmotion data). For each source model, the seismicity parameters (β, λ, and M max) were developed. The results were obtained and are presented in terms of maps and UHS graphs for a 475-year return period, but results for other return periods are easily obtained. The influence of different branch weighting in the logic tree was investigated with respect to the final results. Peak ground acceleration values for Cuba were found to vary from less than 75 to 230 cm=s 2 .

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“…An application of the approach presented is carried out in SE Spain, the area with the highest seismic hazard in Spain. Most of the previous work that partly or wholly addresses this area includes zones only (García-Mayordomo et al, 2007;Benito et al, 2010;Mezcua et al, 2011;IGN-UPM working group, 2013;Salgado-Gálvez et al, 2015) or is based on zoneless methods (Peláez and López-Casado, 2002;Crespo et al, 2014). A first attempt to combine faults and zones was carried out by García-Mayordomo (2005), who developed a zone model for the area taking into account the use of the characteristic earthquake model for faults.…”

Section: Introductionmentioning

confidence: 99%

Approach for combining fault and area sources in seismic hazard assessment: application in south-eastern Spain

Rivas-Medina

Benito

Gaspar‐Escribano

2018

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper presents a methodological approach to seismic hazard assessment based on a hybrid source model composed of faults as independent entities and zones containing residual seismicity. The seismic potential of both types of sources is derived from different data: for the zones, the recurrence model is estimated from the seismic catalogue. For fault sources, it is inferred from slip rates derived from palaeoseismicity and GNSS (Global Navigation Satellite System) measurements. Distributing the seismic potential associated with each source is a key question when considering hybrid zone and fault models, and this is normally resolved using one of two possible alternatives: (1) considering a characteristic earthquake model for the fault and assigning the remaining magnitudes to the zone, or (2) establishing a cut-off magnitude, Mc, above which the seisms are assigned to the fault and below which they are considered to have occurred in the zone. This paper presents an approach to distributing seismic potential between zones and faults without restricting the magnitudes for each type of source, precluding the need to establish cut-off Mc values beforehand. This is the essential difference between our approach and other approaches that have been applied previously. The proposed approach is applied in southern Spain, a region of low-to-moderate seismicity where faults move slowly. The results obtained are contrasted with the results of a seismic hazard method based exclusively on the zone model. Using the hybrid approach, acceleration values show a concentration of expected accelerations around fault traces, which is not appreciated in the classic approach using only zones.

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Seismic hazard of the Iberian Peninsula: evaluation with kernel functions

Cited by 9 publications

References 40 publications

Review article: Deterministic seismic hazard assessment of the area comprised between west Gulf of Cádiz and east Alboran Sea

Review article: Deterministic seismic hazard assessment of the area comprised between west Gulf of Cádiz and east Alboran Sea

Seismic Hazard for Cuba: A New Approach

Approach for combining fault and area sources in seismic hazard assessment: application in south-eastern Spain

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