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Modified Mercalli Intensity Maps for the 1868 Hayward Earthquake Plotted in ShakeMap Format
Entry ID: USGS_OFR_2008_1121

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Abstract: This data set provides Modified Mercalli Intensity maps for the Hayward earthquake of October 21, 1868. To construct the Modified Mercalli Intensity (MMI) ShakeMap for the 1868 Hayward earthquake, we started with two sets of damage descriptions and felt reports. The first set of 100 sites was compiled by A.A. Bullock in the Lawson (1908) report on the 1906 San Francisco earthquake. The second set of 45 sites was compiled by Toppozada et al. (1981) from an extensive search of newspaper archives. We supplemented these two sets of reports with new observations from 30 sites using surveys of cemetery damage, reports of damage to historic adobe structures, pioneer narratives, and reports from newspapers that Toppozada et al. (1981) did not retrieve.

[Summary provided by the USGS.]
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Description: ShakeCast - An Application for Automating ShakeMap Delivery to Critical Users and Facilitating Notification of Shaking Levels.
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Caption:  1868 Hayward Earthquake
Geographic Coverage
Spatial coordinates   
  N: 39.0   S: 37.0   E: -121.0   W: -123.0

Data Set Citation
Dataset Originator/Creator: John Boatwright and Howard Bundock
Dataset Title: Modified Mercalli Intensity Maps for the 1868 Hayward Earthquake Plotted in ShakeMap Format
Dataset Series Name: USGS Open File Report
Dataset Release Date: 2008
Dataset Release Place: USA
Dataset Publisher: U.S. Geological Survey
Version: 1.0
Issue Identification: 2008-1121
Data Presentation Form: online files
Online Resource:
ISO Topic Category
Data Set Progress
Originating Center
Data Center
Publications-Western Region,Geological Division, U.S. Geological Survey, U.S. Department of the Interior Supplemental Info
Data Center URL:

Data Center Personnel
Phone: (650) 329-5404
Email: mdiggles at
Contact Address:
U.S. Geological Survey
345 Middlefield Road
Mail Stop 531
City: Menlo Park
Province or State: CA
Postal Code: 94025
Country: USA
Email: boat at
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2008-04-28
Last DIF Revision Date: 2018-05-29