A Strong-Motion Database of Costa Rica: 20 Yr of Digital Records

Fernández, César Aarón Moya; Ureña, Luis Pinzón; Díaz, Vìctor Schmidt; Hidalgo-Leiva, Diego A.; Beneit, Luis Gonzaga Pujades

doi:10.1785/0220200036

Cited by 11 publications

(8 citation statements)

References 46 publications

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“…The available 21 ground motions pairs (only horizontal components) were selected. Sensor orientationindependent IMs [6,8,9] were estimated for both the peak ground acceleration (PGA) and the spectral response (Sa). These measures were compared with the traditional ones (e.g., the larger of the two as-recorded components and the geometric mean of the as-recorded components).…”

Section: Introductionmentioning

confidence: 99%

Case Study of a Heavily Damaged Building during the 2016 MW 7.8 Ecuador Earthquake: Directionality Effects in Seismic Actions and Damage Assessment

et al. 2021

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In this work, the directionality effects during the MW 7.8 earthquake, which occurred in Muisne (Ecuador) on 16 April 2016, were analyzed under two perspectives. The first one deals with the influence of these effects on seismic intensity measures (IMs), while the second refers to the assessment of the expected damage of a specific building located in Manta city, Ecuador, as a function of its azimuthal orientation. The records of strong motion in 21 accelerometric stations were used to analyze directionality in seismic actions. At the closest station to the epicenter (RRup = 20 km), the peak ground acceleration was 1380 cm/s2 (EW component of the APED station). A detailed study of the response spectra ratifies the importance of directionality and confirms the need to consider these effects in seismic hazard studies. Differences between IMs values that consider the directionality and those obtained from the as-recorded accelerograms are significant and they agree with studies carried out in other regions. Concerning the variation of the expected damage with respect to the building orientation, a reinforced concrete building, which was seriously affected by the earthquake, was taken as a case study. For this analysis, the accelerograms recorded at a nearby station and detailed structural documentation were used. The ETABS software was used for the structural analysis. Modal and pushover analyses were performed, obtaining capacity curves and capacity spectra in the two main axes of the building. Two advanced methods for damage assessment were used to obtain fragility and mean damage state curves. The performance points were obtained through the linear equivalent approximation. This allows estimation and analysis of the expected mean damage state and the probability of complete damage as functions of the building orientation. Results show that the actual probability of complete damage is close to 60%. This fact is mainly due to the greater severity of the seismic action in one of the two main axes of the building. The results are in accordance with the damage produced by the earthquake in the building and confirm the need to consider the directionality effects in damage and seismic risk assessments.

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Section: Introductionmentioning

confidence: 99%

Case Study of a Heavily Damaged Building during the 2016 MW 7.8 Ecuador Earthquake: Directionality Effects in Seismic Actions and Damage Assessment

et al. 2021

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“…The primary objective of this study is to examine and evaluate the directionality effects of the Costa Rican Strong Motion Database (CRSMD) [15]. However, note that Figures 1 and 2 illustrate the directionality effect in the time domain focusing, in this case, on the peak acceleration, i.e., in the null period in the frequency domain.…”

Section: Introductionmentioning

confidence: 99%

Correction Factors to Account for Seismic Directionality Effects: Case Study of the Costa Rican Strong Motion Database

Pinzón,

Hidalgo-Leiva,

Pujades

2024

Geosciences

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This article presents the findings of a study on the directionality effect observed in strong motion records. We set out to establish ratios between several seismic intensity measures that depend on sensor orientation (e.g., GMar, Larger) and others that are orientation-independent (e.g., RotDpp, GMRotDpp, and GMRotIpp), with the intention of proposing multiplicative correction factors. The analysis included an evaluation of the impact of site conditions, ground motion intensity, earthquake magnitude, and hypocentral distance on these ratios. Following a concise overview of the directionality effects and the associated intensity measures, the Costa Rican Strong Motion Database, comprising a total of 4199 horizontal accelerograms (two components), was employed to determine the correction factors. The analysis was carried out for 5% damped response spectra within the 0.01–5 s period range. The study focuses on orientation-independent intensity measures that are derived by combining the maximum values from the recorded motions. In the comprehensive analysis of the complete database, a trend was observed between these intensity measures and the magnitude of the earthquake along with the hypocentral distance. Specifically, records from earthquakes with greater magnitudes exhibited a lower maximum spectral response to the geometric mean of the response spectra of the as-recorded (ar) components ratio (RotD100/GMar), similar to records from earthquakes with larger hypocentral distances. Based on these findings, a proposal was put forth to estimate RotD100 values using GMar values. This ratio can prove useful in transforming data from previous seismic hazard studies, including those applied in many seismic codes, and in defining the maximum anticipated seismic intensity for design purposes in a more straightforward manner.

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“…Costa Rica is considered one of the countries with the greater seismicity of the region. Its complex tectonic framework, subduction zone and active volcanism in the continental zone, has motivated to develop more studies to reduce the seismic risk of the country (Protti and McNally 1994;Quintero and Güendel 2000;Moya-Fernández et al 2020). In seismic risk studies, three features must be taken into account: the hazard, vulnerability and damage value.…”

Section: Introductionmentioning

confidence: 99%

“…The network has more than 150 active accelerometric stations around the country. Further details about the network can be found in Moya-Fernández et al (2020).…”

Section: Introductionmentioning

confidence: 99%

Seismic site classification of the Costa Rican Strong-Motion Network based on VS30 measurements and site fundamental period

et al. 2022

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In this paper, a new seismic site classification for the Costa Rican Strong-Motion Network (CRSMN) is proposed. The soil profile classification of the Costa Rican Seismic Code based on the average shear-wave velocity of the top 30 m (VS30) is used as a reference. The site fundamental period (Tf) is included as a parameter to complement the existing characterization. For this, the VS30 measurements from 52 accelerometric stations are related to the site fundamental period obtained through horizontal-to-vertical spectral ratios (HVSR) using ground motion records from the Costa Rican Strong-Motion Database. The H/V ratios are estimated with 5% damped acceleration response spectra and with traditional Fourier amplitude spectra from the S-wave window. From the relation between VS30 and Tf, different ranges of Tf are assigned to the existing soil profile classification and a graph with three-lines and four-areas is proposed to classify the stations of the CRSMN.

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A Strong-Motion Database of Costa Rica: 20 Yr of Digital Records

Cited by 11 publications

References 46 publications

Case Study of a Heavily Damaged Building during the 2016 MW 7.8 Ecuador Earthquake: Directionality Effects in Seismic Actions and Damage Assessment

Case Study of a Heavily Damaged Building during the 2016 MW 7.8 Ecuador Earthquake: Directionality Effects in Seismic Actions and Damage Assessment

Correction Factors to Account for Seismic Directionality Effects: Case Study of the Costa Rican Strong Motion Database

Seismic site classification of the Costa Rican Strong-Motion Network based on VS30 measurements and site fundamental period

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