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- Title
Proxy-based V<sub>s30</sub> modelling of the Muzaffarabad, northern Pakistan.
- Authors
Ahmed, Tanveer; Rehman, Khaista; Shafique, Muhammad; Ali, Wajid; Shah, Nisar Ali
- Abstract
The time-averaged shear wave velocity in the upper 30 m of soil, also known as Vs30 is the basic criteria employed in the seismic site condition and site response analysis. Vs30 is globally utilized in preparing Seismic Site Characterization Maps (SSCMs) regardless of its considerable limitations. This paper presents the acquisition, and interpretation of 280 real-field Vs30 measurements using a geophysical instrument named Tromino. Models have been derived based on the three proxies i.e., geological age, lithology and topographic slope. Data analysis and statistical approaches show a good correlation between measured Vs30 values with the adopted proxies. The models presented in this work consider topographic slope based on a 30 m resolution digital elevation model (DEM) in addition to the three geological age and four lithological groups. Cross-correlation of the proxies is performed to correlate the proxies for constructing proxy-based models. Proxy performance evaluation is carried out on the basis of residual analysis and the correlation between real-field Vs30 measurements and Vs30 values estimated from proxies is offered to assess the Vs30 predictive capacity of these proxies. The study establishes a strong correlation between measured Vs30 values in densely populated areas and Vs30 values estimated through proxies, suggesting the viability of geological age, lithology, and slope as effective proxies for local-scale Vs30 estimation. The models introduced in the study are assessed for proxy performance, and scatter plots for slope-dependent geological units are provided for further evaluation. The final SSCM (Vs30 map) categorizes the area into National Earthquake Hazard Reduction Programme (NEHRP) site classes which shows that most of the area is prone to amplified seismic response.
- Subjects
PAKISTAN; GEOPHYSICAL instruments; SEISMIC response; DIGITAL elevation models; CONDITIONED response; SCATTER diagrams
- Publication
Environmental Earth Sciences, 2024, Vol 83, Issue 6, p1
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-024-11502-8