Seismic Hazard | preetish kakoty

Participated in 2025 Taiwan-Japan-New Zealand Seismic Hazard Assessment Workshop in Yilan, Taiwan.

Fri, 07 Nov 2025 00:00:00 +0000

I participated in the 2025 Taiwan-Japan-New Zealand Seismic Hazard Assessment Workshop, where experts and leaders in the three countries and beyond shared updates on various aspects of modelling and application in respective national models. Discussions covered a wide variety of topics, including time-dependent earthquake models, nonlinear soil modelling, nonergodic ground-motion models, temporal variability in fault slip rates, physics-based ground motion simulation and applications among others.

A particularly memorable part of the workshop was the organized field trip to Hualien on Taiwan’s east coast, which experienced an Mw 7.4 earthquake in April 2024. We visited the MiDAS research facility, where distributed acoustic sensing (DAS) technology has been deployed along the Milun Fault. We observed preserved ground displacements from the 2024 earthquake and saw art installations that commemorate the event and raise community awareness. On the second day we explored Taroko National Park and visited multiple sites where co-seismic landslides altered the landscape. The park visitor centre hosted a thoughtfully presented exhibit documenting the damage and recovery, highlighting community efforts to restore the landscape, including replanting native species uprooted by the landslides. Although the park is not yet fully functional, the visit served as a powerful reminder of how profoundly such events affect regions and communities.

The Global Travel Grant made this entire experience possible, and I am deeply thankful to the Seismological Society of America for their support.

Presented a poster during 2025 Annual Meeting of QuakeCore in Dunedin, New Zealand.

Thu, 04 Sep 2025 00:00:00 +0000

I presented a poster on “Earthquake scenarios and corresponding seismic hazard maps for four locations across Aoteroa New Zealand” during the 2025 Annual Meeting of QUakeCore that was organized in Dunedin, New Zealand during 1-4 September, 2025.

This work is part of the ongoing project Selection of Earthquake Scenarios for Wellington funded by Natural Hazards Commission Toka Tū Ake.

Delivered a presentation at the 14th International Conference on Structural Safety and Reliability in Los Angeles, USA.

Tue, 03 Jun 2025 00:00:00 +0000

I presented our work titled “Framework for Selecting Representative Earthquake Scenarios: A Case Study for Wellington, New Zealand” during a session titled “Multi-hazard resilience quantification of community systems for informed mitigation, climate adaptation, and post-event management” during the 14th International Conference on Structural Safety and Reliability. This oonference was organized at the University of Southern California in Los Angeles during 1-6 June, 2025.

This work is part of the ongoing project Selection of Earthquake Scenarios for Wellington funded by Natural Hazards Commission Toka Tū Ake.

Delivered a presentation at the 2025 New Zealand Society of Earthquake Engineering Annual Technical Meeting in Auckland, New Zealand.

Tue, 08 Apr 2025 00:00:00 +0000

I presented our ongoing work on “Framework for Selection of Representative Earthquake Scenarios for Wellington”” during a session titled “– Engineering Seismology, Seismic Hazard and Ground Motions” during the 2025 New Zealand Society of Earthquake Engineering Annual Technical Meeting that was organized in Auckland, New Zealand during 8-11 April, 2025.

This work is part of the ongoing project Selection of Earthquake Scenarios for Wellington funded by Natural Hazards Commission Toka Tū Ake.

Selection of Earthquake Scenarios for Wellington

Tue, 18 Mar 2025 00:00:00 +0000

Earthquake scenarios are critical within the context of seismic risk assessments, supporting effective risk communication and informing long-term policy decisions for risk mitigation. They also enable detailed analysis of cascading hazards such as landslides, liquefaction, and tsunamis. Despite their utility, a standardized framework for selecting representative scenarios from probabilistic seismic hazard analysis (PSHA) models remains absent.

This research addresses this gap by proposing a systematic framework to select representative earthquake scenarios using disaggregation data from national-scale PSHA models. A case study focused on Wellington, New Zealand, utilizing the 2022 national seismic hazard model, is presented to highlight the implementation of the framework. This study outlines the selection process, performs seismic hazard analysis for the selected deterministic scenarios, and conducts residual analysis to compare scenario-based hazard estimates with probabilistic models, exploring their relevance.

📰 Journal Article

Framework for Selecting Representative Earthquake Scenarios for Regional Risk Simulation (In preparation)

📰 Conference Presentation

👥 Collaborators

Ken Elwood
Chris Di Caprio
Sanjay S Bora

Impacts of simulated M9 Cascadia Subduction Zone earthquakes considering amplifications due to the Georgia sedimentary basin on reinforced concrete shear wall buildings

Fri, 30 Oct 2020 00:00:00 +0000

Georgia Basin Amplification Factors for M9 Cascadia Earthquakes

Sat, 01 Jun 2019 00:00:00 +0000

This project quantifies long-period spectral acceleration amplification due to the Georgia sedimentary basin in Metro Vancouver.

Using a suite of 30 broadband simulations of M9 Cascadia Subduction Zone earthquakes, we benchmark ground motions against national models and derive period-dependent basin amplification factors (BAFs). These factors are validated using empirical data from the 2001 Nisqually earthquake and used to propose a framework for modifying Uniform Hazard Spectra (UHS) to better reflect the amplification effects.

The findings have implications for seismic hazard mapping, performance-based design, and future editions of the National Building Code of Canada.

📖 Journal Article

🎤 Conference Presentation

👥 Collaborators

Carlos Molina Hutt
Sai Mithra Dyaga
Hadi Ghofrani
Sheri Molnar

Seismic Hazard | preetish kakoty

Participated in 2025 Taiwan-Japan-New Zealand Seismic Hazard Assessment Workshop in Yilan, Taiwan.

Presented a poster during 2025 Annual Meeting of QuakeCore in Dunedin, New Zealand.

Delivered a presentation at the 14th International Conference on Structural Safety and Reliability in Los Angeles, USA.

Delivered a presentation at the 2025 New Zealand Society of Earthquake Engineering Annual Technical Meeting in Auckland, New Zealand.

Selection of Earthquake Scenarios for Wellington

📰 Related Publication

📰 Journal Article

📰 Conference Presentation

👥 Collaborators

Impacts of simulated M9 Cascadia Subduction Zone earthquakes considering amplifications due to the Georgia sedimentary basin on reinforced concrete shear wall buildings

Georgia Basin Amplification Factors for M9 Cascadia Earthquakes

📰 Related Publication

📖 Journal Article

🎤 Conference Presentation

👥 Collaborators