USGS Earthquake Hazards Program

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<title>USGS Earthquake Hazards Program</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="keywords" content="earthquake, earthquakes, united states, world, san francisco, california, nevada, moment, epicenter, fault, focus, wave, seismicity, seismic, foreshock, aftershock, tremor, magnitude, magnitude scale, intensity, intensity scale, richter, mercalli, plate, seismogram, seismograph, seismologist, seismology, geophysics, geologist, subduction, tsnuamis, hypocenter, quake, quakes"> <base target="_top"> <script language="JavaScript1.3">  </script> <noscript> <link rel="stylesheet" type="text/css" href="/web/20051124073623cs_/http://pasadena.wr.usgs.gov/images_program/all-others.css"> </noscript> <style type="text/css">  </style> </head> <body bgcolor="#FFFFFF" leftmargin="0" rightmargin="0" link="#003399" vlink="#000000" alink="#cc3300" marginwidth="0" topmargin="0" marginheight="0"> <table width="100%" border="0" cellpadding="0" bgcolor="#ffffff" cellspacing="0"> <tr bgcolor="#0066FF"> <td><a href="https://web.archive.org/web/20051124073623/http://www.usgs.gov/"><img src="/web/20051124073623im_/http://pasadena.wr.usgs.gov/images_program/banner_sm.gif" border="0" width="550" height="64" alt="Link to USGS home page"></a></td> </tr> </table> <table border="0" cellspacing="0" cellpadding="2" width="100%" bgcolor="#0066ff"> <tr> <td bgcolor="#999999"> <div align="center"> <b><a href="https://web.archive.org/web/20051124073623/http://earthquake.usgs.gov/recenteqs/" class="tab">Latest Quakes</a></b> </div></td> <td bgcolor="#0066FF" background="/web/20051124073623im_/http://pasadena.wr.usgs.gov/images_program/tabs.gif"> </td> <td bgcolor="#999999"> <div align="center"><b><a href="https://web.archive.org/web/20051124073623/http://earthquake.usgs.gov/bytopic/" class="tab">EQ Facts & Lists</a></b></div></td> <td bgcolor="#0066FF" 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<td bgcolor="#999999"> <div align="center"><b><a href="https://web.archive.org/web/20051124073623/http://earthquake.usgs.gov/scitech/" class="tab">Science & Technology </a></b></div></td> </tr> </table> <table width="100%" border="0" cellspacing="0" cellpadding="0" bgcolor="#999999"> <tr> <td align="center"> <table bgcolor="#cccccc" border="0" cellspacing="0" cellpadding="3"> <tr align="center"> <td>  </td> <td class="nav"><a href="https://web.archive.org/web/20051124073623/http://earthquake.usgs.gov/" class="nav">HOME</a></td> <td><b><font color="#000000">|</font></b></td> <td><a href="https://web.archive.org/web/20051124073623/http://earthquake.usgs.gov/about_us/" class="nav">ABOUT US</a></td> <td><b><font color="#000000">|</font></b></td> <td><a href="https://web.archive.org/web/20051124073623/http://earthquake.usgs.gov/image_glossary/" class="nav">EQ GLOSSARY</a></td> <td><b><font color="#000000">|</font></b></td> <td><a 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<td><img src="/web/20051124073623im_/http://pasadena.wr.usgs.gov/images_program/shim.gif" width="1" height="1" alt="spacer"></td> </tr> </table>   <table width="100%" border="0" cellpadding="0" cellspacing="0"> <tr> <td width="145" bgcolor="#CCCCCC" background="/web/20051124073623im_/http://pasadena.wr.usgs.gov/images_program/quakebg.gif" valign="top"> <div align="center"> <p>  <center> <h3><font color="#cc0000" face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular"> Report an<br>Earthquake</font></h3> </center> <p> <hr> <center> <h2><font face="Arial,Helvetica,sans-serif,">United States:</font></h2> </center> <a href="ca/index.html" class="tabs"><font face="Arial,Helvetica,sans-serif," size="3" color="#0000FF"><b>California</b></font></a><p> <a href="ak/index.html" class="tabs"><font face="Arial,Helvetica,sans-serif," size="3" color="#0099cc"><b>Alaska</b></font></a><p> <a href="hi/index.html" class="tabs"><font face="Arial,Helvetica,sans-serif," size="3" color="#cc0099"><b>Hawaii</b></font></a><p> <a href="imw/index.html" class="tabs"><font face="Arial,Helvetica,sans-serif," size="3" color="#FF9600"><b> Western Mountain</b></font></a><p> <a href="pnw/index.html" class="tabs"><font face="Arial,Helvetica,sans-serif," size="3" color="#FF0000"><b>Pacific Northwest</b></font></a><p> <a href="ne/index.html" class="tabs"><font face="Arial,Helvetica,sans-serif," size="3" color="#9632c8"><b>Northeast</b></font></a><p> <a href="cus/index.html" class="tabs"><font face="Arial,Helvetica,sans-serif," size="3" color="#006400"><b>Central US</b></font></a><p> <a href="prt/index.html" class="tabs"><font face="Arial,Helvetica,sans-serif," size="3" color="#009966"><b>Puerto Rico & US Territories</b></font></a><p> <center> <h2><a href="ous/index.html" class="tabs"><font face="Arial,Helvetica,sans-serif," color="#000000"><b>Other countries</b></font></a></h2> </center> <p>  </div> </td> <td valign="top" width="*" bgcolor="#FFFFFF">  <blockquote> <p> <p> <font face="arial, helvetica" , size="5"><font color="#000066">Did you feel it?</font>   <font face="arial, helvetica" , size="4"><font color="#000066">Select Region from Map or List</font> <img border="0" src="/web/20051124073623im_/http://pasadena.wr.usgs.gov/shake/icons/usamap.gif" alt="click on US map to select your region" usemap="#map" map> <p> <hr> <font face="Arial,Helvetica,sans-serif" , size="3"> This is a <a href="/web/20051124073623/http://pasadena.wr.usgs.gov/" target="_top">U.S. Geological Survey</a> project to collect information about ground shaking following significant earthquakes. You can help us by filling out a questionnaire for each earthquake you feel. A <a href="ca/html/background.html">Community Internet Intensity Map</a> will be made and updated every few minutes following a major earthquake. At first only a few ZIP codes will have intensities assigned, but over time others will be assigned as data comes in. Check back often and watch the maps change!<p> <p> </font> </blockquote>  </td> </tr> </table> <span class="tab"></span>  <table width="100%" bgcolor="#000000" border="0" cellspacing="0" cellpadding="0"> <tr> <td><img src="/web/20051124073623im_/http://pasadena.wr.usgs.gov/shake/images/shim.gif" width="1" height="1" alt="spacer"></td> </tr> </table> <table width="100%" border="0" cellspacing="0" cellpadding="5" bgcolor="#FFFFFF"> <tr valign="top"> <td align="left"> <p> <font color="#000000" size="2" face="Arial, Helvetica, sans-serif" class="footer"><a href="https://web.archive.org/web/20051124073623/http://www.doi.gov/">U.S. Department of the Interior</a>, <a href="https://web.archive.org/web/20051124073623/http://www.usgs.gov/">U.S. Geological Survey</a> <br> This page is brought to you by the Earthquake Hazards Program<br> URL: http://pasadena.wr.usgs.gov/shake<br> Maintained by: Web Team and CIIM Working Group<br> Last modification: 9.4.2003 <br> Contact Us:<a href="/web/20051124073623/http://pasadena.wr.usgs.gov/shake/ca/html/comment_form.html">Comment Form</a><br> <br> USGS <a href="https://web.archive.org/web/20051124073623/http://www.usgs.gov/privacy.html">Privacy Statement</a> | | <a href="https://web.archive.org/web/20051124073623/http://www.usgs.gov/disclaimer.html">Disclaimer</a> | | <a href="https://web.archive.org/web/20051124073623/http://www.usgs.gov/foia/" target="_top">FOIA</a> | | <a href="https://web.archive.org/web/20051124073623/http://www.usgs.gov/accessibility.html">Accessibility</a></font> </p> </td> <td align="right"> <div align="right"><a href="https://web.archive.org/web/20051124073623/http://firstgov.gov/"><img src="/web/20051124073623im_/http://pasadena.wr.usgs.gov/images/first_gov.gif" width="160" height="47" alt="First Government graphic" border="0"></a></div> </td> </tr> </table> </body> <map name="map"> <area shape="poly" coords="190,207,190,223,249,270,382,270,424,147,410,147,407,141,372,141,372,28,208,28,208,129,222,129,222,165,215,165,215,207,190,207" href="cus/index.html" onmouseout="window.status=''" onmouseover="window.status='Central US'; return true"> <area shape="poly" coords="96,119,96,147,134,182,134,223,190,223,190,207,215,207,215,165,222,165,222,129,208,129,208,28,117,28,117,119" href="imw/index.html" onmouseout="window.status=''" onmouseover="window.status='W. 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