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WITHDRAWN Ground Motion Characterization in Regions of “Intermediate” Attenuation

Description: 

WITHDRAWN For shallow crustal earthquakes, global ground motion models (GMMs) are generally grouped in two categories, those for “Active Tectonic Regions” (low Q, fast attenuation) and those for “Stable Continental Regions” (high Q, slow attenuation). The recent empirical GMMs developed for active tectonic regions take advantage of large strong motion datasets (e.g. NGA West2 and NGA East). While these datasets make use of strong motion data from around the world, they are mostly dominated by recordings from North America. These GMMs are often used to represent ground shaking in parts of the world where locally recorded data is sparse. However, in many cases, the attenuation in the source region (where strong motion was recorded) does not match the target region (too low or too high for the target region). This can be due to various reasons, including small- or large-scale geological differences. Where strong motion recordings are sparse, this poses a challenge in characterizing the ground motions for the purposes of seismic hazard assessments. We present how attenuation tomography studies and ground motion simulations can be useful in these cases, using case studies from regions where attenuation is neither as high as California or as low as eastern North America. We also highlight a case study from the Caucasus, which shows that the deviation of attenuation from global GMMs can be period/frequency-dependent.

Session: Accuracy and Variability of Physics-based Ground Motion Modeling [Poster]

Type: Poster

Date: 4/15/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Tuna

Student Presenter: No

Invited Presentation: 

Poster Number: 87

Authors