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PGA Estimation for Indian Himalayan Region Using ANN: Ranking Approach for Selection of Best Model

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Abstract

In site seismic characterization, peak ground acceleration (PGA) is an important parameter, along with response spectrum/time history, etc. Expanding strong motion network has been complemented by data sharing through satellite links. PGA is generally estimated using empirical expressions developed from this data (earthquake magnitude, distance from the site, etc.) and these have been updated periodically with fresh records. Certain studies added new factor/s specific to site, soil conditions, etc. for getting improved estimates of PGA. However, as estimation of PGA involves multiple uncertainties, the accuracy achieved by these equations leaves ample scope of improvement. In this article, development of data-driven model/s for estimation of PGA is presented using artificial neural network, using readily available recorded data from the literature. The best ANN models had a correlation between 0.86 and 0.89, mean absolute error between 18 and 25 gals, and root mean square error between 36 and 44 gals, indicating good performance. Out of 32 test data, only 2 (6%) of the estimates fell outside the one standard deviation limits on either side of the perfect fit for Set 1, one (3%) each in case of Set 2 and Set 3, and this can be considered to be a pretty good fit. The case study for Himalayan region in India would demonstrate comprehensive model evaluation followed by an intuitive ranking system to select the best model from a few candidate models.

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Data Availability

Data used in this study are available in the literature, and the listing may be shared on request.

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Acknowledgements

The authors sincerely acknowledge the authors of articles/reports, from which data were used for this study. The authors would take this opportunity to express gratitude to the anonymous reviewers for their insightful comments and suggestions for improving the manuscript.

Funding

This research did not receive any funding from any agency.

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Contributions

SD: conceptualization and methodology; all authors: literature review and data; SD: model development and analysis; authors: comparative analysis; SD and SK: writing. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript (original and revised).

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Correspondence to Saha Dauji.

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Appendix: Detailed results and ANN model selection for Set 2 and Set 3

Appendix: Detailed results and ANN model selection for Set 2 and Set 3

See Tables 7 and 8.

Table 7 Performance of the 12 ANN models and ranking: Set 2
Table 8 Performance of the 12 ANN models and ranking: Set 3

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Dauji, S., Karmakar, S. & Singh, R. PGA Estimation for Indian Himalayan Region Using ANN: Ranking Approach for Selection of Best Model. Trans Indian Natl. Acad. Eng. 7, 243–258 (2022). https://doi.org/10.1007/s41403-021-00273-4

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  • DOI: https://doi.org/10.1007/s41403-021-00273-4

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