Tidal fluctuations affect fault-line tremors


	Tidal fluctuations affect fault-line tremors

onleyone

11-25-2007 9:15 PM

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tags:

tide, tidal, fault, seismic, tremor, moon, phases, pulse, arrays

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/7fb844f2-4eb4-4e1d-a063-6bd3bb821e14/3878608E-F062-44D0-A1A9-6A36EAC066C0/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://environment.newscientist.com/channel/earth/dn12952-tidal-link-to-earthquakes-revealed-at-last.html?feedId=online-news_rss20" href="http://environment.newscientist.com/channel/earth/dn12952-tidal-link-to-earthquakes-revealed-at-last.html?feedId=online-news_rss20" style="font-size: 11px;">environment.newscientist.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://environment.newscientist.com/channel/earth/dn12952-tidal-link-to-earthquakes-revealed-at-last.html?feedId=online-news_rss20"><P>"Since the late 1800s, seismologists have been trying to connect earthquakes and tides," explains co-author Justin Rubinstein. The theory is that by adding or removing pressure, the gravitational effects of the Sun and Moon pulling on Earth, combined with the effect of water being piled on top of faults, should make it more or less easy for a fault to shift.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://environment.newscientist.com/channel/earth/dn12952-tidal-link-to-earthquakes-revealed-at-last.html?feedId=online-news_rss20"><P>"But time and time again people who study the relationship between earthquakes and tides don't see one," says Rubinstein.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://environment.newscientist.com/channel/earth/dn12952-tidal-link-to-earthquakes-revealed-at-last.html?feedId=online-news_rss20"><P>That is why he and his colleagues were so excited when they looked at the data collected by their seismic arrays between 2004 and 2007.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://environment.newscientist.com/channel/earth/dn12952-tidal-link-to-earthquakes-revealed-at-last.html?feedId=online-news_rss20"><P>"What we see is that tremor seems to pulse," Rubinstein explains. The graphs show that during the two to three weeks of tremor activity, there are stronger and weaker phases, and the timing of these phases corresponds to the timing of the tides.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://environment.newscientist.com/channel/earth/dn12952-tidal-link-to-earthquakes-revealed-at-last.html?feedId=online-news_rss20"><P>The final effect is that tremor is stronger when the tide is high and weaker when the tide is low.</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/3878608E-F062-44D0-A1A9-6A36EAC066C0/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>