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Understanding 3D Earthquake Distribution in SoCal

Explore seismic events in Southern California, analyze aftershocks, fault surfaces, and historical earthquakes. Access data sets, visualize patterns, and predict future quakes. Download 3D PDFs for in-depth exploration.

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Understanding 3D Earthquake Distribution in SoCal

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  1. 3D earthquake and fault distribution in southern California Michele Cooke and Scott Marshall University of Massachusetts

  2. From Southern California Earthquake Center Faults of Southern California • Community Fault Model

  3. 3D PDF • Lots of formats out there • VRML • GoCad • DXF • 3D PDF only needs Adobe Reader 7.0 or greater to render

  4. Earthquake Data Set SCEC datacenter: http://www.data.scec.org/

  5. Activity Learning Goals • Spatial and temporal distribution of Earthquakes distributions reflect a dynamic system. • Aftershocks • Triggering • Off-fault deformation • Definition of active fault surfaces • Resolution of seismic sources

  6. Earthquake Data Set • Each student assigned a set of years • Download the earthquake catalog from those years.

  7. Information on significant historic quakes • http://www.data.scec.org/chrono_index/quakedex.html • 1990 Upland EQ M 5.4 • 1991 Sierra Madre EQ M5.8 • 1994 Northridge EQ M6.7

  8. Individual Questions • Do some of your earthquakes appear to be aftershocks? How do you know this? • Does the maximum depth of seismicity appear uniform across the region? What does this imply about the pressure an temperate conditions in the crust? • Do all the quakes appear to have occurred on known active fault surfaces? What could account for earthquakes off of the mapped fault surfaces?

  9. Compile all the visualizations • Examine the spatial and temporal patterns

  10. Group Questions • For how long do the aftershocks of the Northridge earthquake continue? • The Sierra Madre quake has few aftershocks compared to the uplands and Northridge earthquakes. Why? • Do you think the CFM should include additional faults? • Where would you predict earthquakes within the next two year period?

  11. Download 3D PDFs • ftp://eclogite.geo.umass.edu/pub/marshall/3D_Earthquakes/ • 3D PDFs are created using Adobe 3D software

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