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A Framework for Implementing a New Intensity Metric for USGS’s Shakemap: Cumulative Absolute Velocity (CAV)

Description: 

The U.S. Geological Survey's (USGS) ShakeMap has been providing rapid, global estimates of earthquake shaking characteristics for decades. USGS has provided ground shaking characteristics as maps of intensity measures (IM) such as peak ground velocity, peak ground acceleration, spectral acceleration (at three periods), and macroseismic intensity. These products have been effectively used by emergency managers, loss modelers, engineers concerned about post-event structural performance, and even for insurance products. However, more advanced IMs offer important benefits for characterizing the ground shaking intensity by accounting for energy and duration of shaking, which have the potential to be useful for applications that include assessing the potential for failure involving landslides, liquefaction, and critical infrastructure. These metrics include cumulative absolute velocity (CAV), Arias intensity, significant duration, and permanent static displacement. We present a framework for implementing CAV in ShakeMap. There are numerous models to estimate CAV, because they were developed for specific regions and tectonic environments. We start by developing a database of recorded CAV values for a specific region along with predicted CAV values from ground motion models (GMMs). We use OpenQuake to predict CAV values with GMMs, but since many GMMs of CAV are not currently available in OpenQuake, we must contribute them. Since the USGS produces ShakeMaps on a global scale, it is imperative that we test and expand the suitability of the models for all possible regions and tectonic environments, which can then be done for other IMs. We expect our work to improve hazard assessment of landslides, liquefaction, and infrastructure, and advance earthquake science and operations.

Session: Creating Actionable Earthquake Information Products [Poster Session]

Type: Poster

Date: 5/1/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Kyle

Student Presenter: No

Invited Presentation: 

Authors