Scientific Motivation

The majority of effort in post-earthquake geologic response will center on detailed mapping and measurement of the ground rupture. These maps are fundamental to understanding the earthquake rupture and for corroborating investigations of fault slip from seismic and geodetic data. Previous mapping of historic ruptures has had lasting impact on understanding earthquake phenomena, such as the width of damage zones and the role of step-overs in nucleating or arresting rupture. For a rupture in southern California, field mapping will also complement analysis of before- and after-lidar imagery. The overall mapping effort will take place over several weeks after the earthquake. However, there is extra merit to rapid assessment of the ground rupture (within the first 24-48 hours) for planning geophysical experiments, imagery acquisition, and for assessing damage to lifelines. Because many SCEC geologists are situated within or near to southern California, SCEC is well positioned to coordinate such a rapid assessment. [Read more on Geology Field Coordination Plans]

Field Meeting Locations

Due to the likelihood of limited communication after a large, destructive earthquake, it is wise to pre-arrange meeting points where scientists will gather to share results, transmit data, and plan further efforts. The USGS, CGS, and SCEC are working together to define these sites for likely scenario events. View and suggest additional meeting sites: Pre-arranged Field Meeting Locations.

Field Data Collection

The USGS has developed forms to facilitate the collection of geologic field data. Download field data forms: fault rupture, liquefaction, and slope movement. Contact Luke Blair (USGS) for more information on the USGS process of field data collection.

Submit field data by:

• Calling or sending data forms to the USGS Field Operations Coordinator (Erik Pounders)
• Using handheld devices
• Completing online form (only Fault Rupture Online Form is currently available)

The data is compiled and displayed at an internet map server.