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This image service is part of a collection of 10 ground motion maps that allow users to visualize and compare seismic hazards in terms of different ground motion parameters in various areas in California. They illustrate that the highest hazard areas are near major active faults and factors such as proximity to faults and local geologic conditions influence shaking intensity. |
| summary:
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This image service is part of a collection of 10 ground motion maps that allow users to visualize and compare seismic hazards in terms of different ground motion parameters in various areas in California. They illustrate that the highest hazard areas are near major active faults and factors such as proximity to faults and local geologic conditions influence shaking intensity. |
| accessInformation:
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Rui Chen, 2025, Map Sheet 48: Earthquake Shaking Potential for California, California Geological Survey, California Department of Conservation. |
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288895.277144 |
| typeKeywords:
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["ArcGIS Server","Data","Image Service","Service"] |
| description:
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<div style='text-align:justify;'><span style='text-align:start;'>This image service is part of a collection of maps for PGA, PGV and spectral accelerations at 0.2 s (SA02), 1.0 s (SA10), and 2.0 s (SA20) to illustrate seismic hazards in California. For each ground motion parameter, maps at two different hazard levels were presented: one with a 2% probability of being exceeded in 50 years (equivalent to 2,475-year recurrence interval) and the other with 10% probability of being exceeded in 50 years (equivalent to 475-year recurrence interval). The ArcGIS Online interface allows users to select any two ground motion hazard maps to compare side by side. Ground motion parameters were calculated using the 2023 update of the U.S. Geological Survey National Seismic Hazard Model. See the “Scientific Background” on MS48 webpage for detailed information.</span></div><div style='text-align:justify;'><br /></div><div style='text-align:justify;'><div><i><font color='#b22222'>Due to software limitations, symbology cannot be added to this service. To match the symbology used in the <a href='https://maps.conservation.ca.gov/cgs/ms48/groundmotion/' target='_blank'>MS48 Ground Motion application</a>, use the following configuration:</font></i></div><div><ul><li><font color='#b22222'><i>Esri Color Ramp: Inferno</i></font></li><li><font color='#b22222'><i>Minimum: 6.8 cm/s</i></font></li><li><font color='#b22222'><i>Maximum: 269 cm/s</i></font></li><li><font color='#b22222'><i>Gamma: 1</i></font></li></ul></div></div> |
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<div style='text-align:justify;'>Access Constraints: Because digital data are easily altered, cities, counties, and others who use this are advised to obtain the file directly from the Department of Conservation, California Geological Survey. </div><div style='text-align:justify;'><br /></div><div style='text-align:justify;'>LICENSE AGREEMENT: (c) 2025 California Department of Conservation, California Geological Survey. All rights reserved. No part of these data may be reproduced, transmitted, or distributed in any form or by any means, electronic or mechanical for any purpose, without the express written permission of the California Geological Survey.</div><div style='text-align:justify;'><br /></div><div style='text-align:justify;'>Distribution Liability: These data are provided by the California Department of Conservation, California Geological Survey, as is. Any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. In no event shall the California Department of Conservation, California Geological Survey, or its associated contributors be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data, or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) that arise in any way out of the use of these data and software, even if advised of the possibility of such damage. </div><div style='text-align:justify;'><br /></div><div style='text-align:justify;'>The California Department of Conservation, California Geological Survey, makes no warranty, express or implied, regarding the data or its use. It is recommended that careful attention be paid to the contents of any metadata associated with a specific file, and that the originator of the data be contacted with any questions regarding appropriate use. The California Department of Conservation, California Geological Survey, shall not be held liable for improper or incorrect use of the data described and/or contained herein.</div> |
| catalogPath:
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| title:
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Map Sheet 48 (2025 update) - Ground Motion from PGV (2% in 50 years) |
| type:
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Image Service |
| url:
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https://gis.conservation.ca.gov/server |
| tags:
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["MS48","Map Sheet 48","California Geological Survey","CGS","Earthquake Shaking Potential","California Department of Conservation","California Natural Resources Agency","CAOpenData"] |
| culture:
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en-US |
| name:
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MS48_GroundMotion_PGV_2pc50 |
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| minScale:
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1.8489297737236E7 |
| spatialReference:
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WGS_1984_Web_Mercator_Auxiliary_Sphere |