1 / 18

Stress Parameter Variability

Stress Parameter Variability. Walter Silva Pacific Engineering and Analysis September 30, 2009. Stress Parameter, Robust Descriptor of High-Frequency Source Scaling - Appropriate Accommodation of Site-Amplification

taurus
Download Presentation

Stress Parameter Variability

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Stress Parameter Variability Walter Silva Pacific Engineering and Analysis September 30, 2009

  2. Stress Parameter, Robust Descriptor of High-Frequency Source Scaling - Appropriate Accommodation of Site-Amplification • Stress Parameter Variability, Convenient Single Parameter Estimate of Source Variability • GMPEs Include Site Variability • Provides Consistency Check on CENA Aleatory Variability

  3. Small Magnitude σΔσsp • WNA, CENA Comparison • Similarity Suggests Comparable Source Variability • Accommodation of Epistemic Components • Mechanism • Depth

  4. Inversions - Easy, 95% Work is in Developing FAS - Also Get Kappa - Incorporate Site/Crustal Amplification - Recommend Multiple Approaches

  5. NGA Earthquake Data Summary

  6. NGA Earthquake Summary(Cont.)

  7. [1] Correlation between static stress drops and stress parameters

  8. Figure 1. Estimates of static stress drops (circular rupture) computed for the NGA earthquakes listed in Table 1 verses magnitude (M). Note Chi-chi aftershocks and Cape Mendocino earthquake not included.

  9. Figure 2. Estimates of static stress drops computed for the subset (24, Table 1) of NGA earthquakes with stress parameters verses magnitude (M). Shallow slip defined as greater than (or equal) 20% moment released to a depth of 5 km. Deep slip with less than 20% moment released over the top 5 km of the crust.

  10. Figure 3. Estimates of static stress drops (circular rupture) computed for the NGA earthquakes listed in Table 1 verses depth to to-of-rupture (TOR, Table 1). Note Chi-chi aftershocks and Cape Mendocino earthquake not included.

  11. Figure 4. Estimates of static stress drops computed for the subset (24, Table 1) of NGA earthquakes with stress parameters verses depth to top-of-rupture (TOR, Table 1). Shallow slip defined as greater than (or equal) 20% moment released to a depth of 5 km. Deep slip with less than 20% moment released over the top 5 km of the crust.

  12. Figure 5. Estimates of stress parameters computed for the subset (24, Table 1) of NGA earthquakes verses magnitude (M). Shallow slip defined as greater than (or equal) 20% moment released to a depth of 5 km. Deep slip with less than 20% moment released over the top 5 km of the crust.

  13. Figure 6. Estimates of stress parameters computed for the subset (24, Table 1) of NGA earthquakes verses depth to top-of-rupture (TOR, Table 1). Shallow slip defined as greater than (or equal) 20% moment released to a depth of 5 km. Deep slip with less than 20% moment released over the top 5 km of the crust.

More Related