Probabilistic seismic hazard assessment for Taiwan: TEM PSHA2020

Abstract

The Taiwan Earthquake Model (TEM) published the first version of the Taiwan probabilistic seismic hazard assessment (named TEM PSHA2015) 5 years ago. For updating to the TEM PSHA2020, we considered an updated seismogenic structure database, including the structures newly identified with 3D geometry, an earthquake catalog made current to 2016, state-of-the-art seismic models, a new set of ground motion prediction equations, and site amplification factors. In addition to earthquakes taking place on each individual seismogenic structure, the updated seismic model included the possibility of an earthquake occurring on multiple structures. To include fault memory for illustrating activity on seismogenic structure sources, we incorporated the Brownian passage time model. For the crustal seismicity that cannot be attributed to any specific structure, we implemented both area source and smoothing kernel models. A new set of ground motion prediction equations is incorporated. In addition to the calculation of hazard at engineering bedrock, our assessment included site amplification factors that competent authorities of governments and private companies could use to implement hazard prevention and reduction strategies.

Time-Dependent Seismic Hazard Analysis for Induced Seismicity: The Case of St Gallen (Switzerland), Geothermal Field

“…Lastly, in order to account for non-Poisson nature of the induced seismicity, we propose to analyse the inter-arrival times distribution of the current seismicity, and to test it against several PDFs generally used to model the recurrence models with memory e.g., [36][37][38][39][40]. Particularly, in addition to the exponential PDF (corresponding to the Poisson recurrence model) we use the Brownian Passage Time model [41], the Weibull PDF, the Gamma PDF, and the Gaussian PDF.…”

Impact of rupture complexity on seismic hazard: Case of the 2018 Mw7.5 Palu earthquake

“…Some previous studies (e.g., Chan et al, 2020) have proposed innovative approaches that assumed an earthquake could rupture along multiple fault segments. Our approach replies on identification of potential faults/segments that would rupture coseismically.…”

Earthquake forecasting model for Albania: the area source model and the smoothing model

“…2c), which is used to define the a-value for each of the areas. A uniform b-value for all the area sources is sometimes implemented by probabilistic seismic hazard assessment, to minimize the effect of zonation and a low number of events inside each individual area (e.g., Fujiwara et al, 2013;Chan et al, 2020). The a-value which represents the overall activity of the seismic source is calculated based on the unified b-value (Table 1).…”