{"id":30780,"date":"2018-12-05T10:26:39","date_gmt":"2018-12-05T14:26:39","guid":{"rendered":"https:\/\/www.fondriest.com\/news\/?p=30780"},"modified":"2018-12-05T10:26:39","modified_gmt":"2018-12-05T14:26:39","slug":"tracking-aquifer-water-with-seismic-noise","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/tracking-aquifer-water-with-seismic-noise.htm","title":{"rendered":"Tracking Aquifer Water With Seismic Noise"},"content":{"rendered":"

In drought-stressed areas like California where every drop in the aquifer counts, seismic noise may be the key to monitoring water. <\/span>Harvard University<\/span><\/a> PhD student and principal investigator Tim Clements spoke to EM about this recent work, and how it might be a game changer for water watchers across the country.<\/span><\/p>\n

\u201cThe inspiration for this research was the historic drought in California from 2011 to 2017,\u201d explains Clements. \u201cThis was the driest period in recorded history in the state. We started this research after California had implemented the first mandatory water restrictions in state history in 2015.\u201d<\/span><\/p>\n

According to Clements, the team focused their study on the San Gabriel Valley in Los Angeles County for several reasons. First, it is home to more than two million people; residents of the San Gabriel Valley (SGV) depend on groundwater for 40 percent of their water needs during times of drought. Second, from 2012 to 2017, water levels dropped more than 20 meters in the SGV aquifer. Finally, the San Gabriel Valley has an existing seismic network\u2014the Southern California Seismic Network\u2014with seismic data archived back to the late 1990s.<\/span><\/p>\n

The team’s recent work could provide new information about aquifer health day by day.<\/span><\/p>\n

\u201cIn the recently published study, we monitored groundwater levels across the SGV on the timescale of a month,\u201d details Clements. \u201cOur current research is working to bring the timescale of monitoring groundwater levels to minutes. We hope that this will allow for near real-time monitoring of aquifers.\u201d<\/span><\/p>\n

\"aquifer\"

NOAA\u2019s drought status for California as of December 2014. (Credit: NCDCNOAA [Public domain], via Wikimedia Commons)<\/span><\/p><\/div>\n

Ear to the ground<\/span><\/h3>\n

Seismic noise is simply noise, or vibrations, caused by anything taking place on or under the ground. Seismologists study it, hoping to identify signs of trouble\u2014such as earthquakes\u2014more readily. Clements believes that seismic noise has a lot to tell us about water, too.<\/span><\/p>\n

\u201cWe use the change in seismic velocity of the subsurface to infer the change in groundwater level within an aquifer,\u201d Clements describes. \u201cThe velocity of seismic waves traveling through an aquifer is dependent on the amount of water in the aquifer. In our case, a 0.1% drop in seismic velocity is equivalent to a 10-meter increase in groundwater level, because seismic velocity and water levels are anti-correlated in aquifers.\u201d<\/span><\/p>\n

The team then calculates the change in seismic velocity by comparing passive waves\u2014generated by anything from wind to automobiles\u2014measured by a network of seismometers.<\/span><\/p>\n

\u201cThe ‘comparison’ we do is technically called ambient noise cross-correlation, which extracts the wave propagation between two seismometers,\u201d clarifies Clements. \u201cWe then apply coda-wave interferometry to the cross-correlation of seismic noise. Coda-wave interferometry extracts the change of velocity through time (in the SGV basin), which in our case is due to changing groundwater levels).\u201d<\/span><\/p>\n

\"aquifer\"

Observed dv\/v in the San Gabriel Valley (black) compared with groundwater level change (blue) in the Baldwin Park Key Well. Grey bars indicate lowest historical water levels of the Baldwin Park Key Well. Blue patches indicate times of drought. (Credit: Clements, T., & Denolle, M. A. (2018). Tracking Groundwater Levels using the Ambient Seismic Field. Geophysical Research Letters)<\/span><\/p><\/div>\n

The method might even be used to track geological changes to aquifers over time as humans pump water out of them, whether aquifers rebound after precipitation, and if they do, how they do it.<\/span><\/p>\n

\u201cOver the past 15 years there were 3 droughts in Southern California: from 2002 to 2003; from 2007 to 2009; and from 2012 to 2017,\u201d states Clements. \u201cIn each subsequent drought, groundwater levels in the SGV dropped below previous all-time low levels. Groundwater levels rebounded quickly in 2005, while the recovery from 2009 to 2010 was more drawn out. We were able to confirm this using the change in seismic velocity.\u201d<\/span><\/p>\n

The ability for water managers to see these kinds of patterns over time could mean a huge difference in how we decide to shape water policy.<\/span><\/p>\n

\u201cHaving access to this information is important for water management,\u201d asserts Clements. \u201cCalifornia is a great example of this, where they implemented water restrictions during the drought. Water managers and politicians implement policies based on their best knowledge of current aquifer conditions. Hopefully, in the future, our method will give policymakers a near real-time look at aquifer conditions.\u201d<\/span><\/p>\n

Seismic noise and water<\/span><\/h3>\n

Right now, without this technique, researchers can measure water levels at groundwater wells, and then create models to predict the health of the aquifer that connects them based on the measurements and various hydrological parameters. However, that involves not only a great deal of legwork but also a substantial amount of guesswork. The team is now working to establish that the method works for tracking aquifer water\u2014making water depth measurements accurate to within about a centimeter, instead of a kilometer or so, which is the current standard.<\/span><\/p>\n

\"aquifer\"

Groundwater level change in San Gabriel Valley during most recent drought (Fall 2012\u2013Fall 2016). Seismic stations are shown as blue triangles, groundwater wells are shown as yellow circles, and key groundwater wells are shown as green circles. (Credit: Clements, T., & Denolle, M. A. (2018). Tracking Groundwater Levels using the Ambient Seismic Field. Geophysical Research Letters.)<\/span><\/p><\/div>\n

\u201cWe installed an array of 5 seismometers at Tufts University during the summer of 2017,\u201d remarks Clements. \u201cWe installed the seismometers next a network of groundwater pumping wells. My current research is to monitor groundwater levels and hydrological parameters daily on a local scale\u2014less than 1 km horizontally\u2014using the change in seismic velocity. The goal of this project is to explore the feasibility of the method on a local scale.\u201d<\/span><\/p>\n

So far, the results look very promising and indicate that experts may soon have a new tool for assessing aquifer health\u2014and achieving other important goals\u2014at their disposal.<\/span><\/p>\n

\u201cThe technique of measuring the change in seismic velocity of the subsurface is relatively new, with the first work coming out about a decade ago,\u201d adds Clements. \u201cResearchers are using the change in seismic velocity to study a number of different natural and human processes and structures, such as volcanic eruptions, melting glaciers and permafrost, responses of the crust to earthquakes, structural monitoring of bridges and buildings and extraction of oil\/gas.\u201d<\/span><\/p>\n

For right now, though, we’ll keep watching\u2014and listening\u2014to its application in the San Gabriel Valley.<\/span><\/p>\n

Top image: View of California drought in 2014 from Marine One. (Credit: Pete Souza [Public domain])<\/span><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

New research indicates that seismic noise may be a game changing tool in tracking aquifer water health, especially in drought-sensitive areas.<\/p>\n","protected":false},"author":31,"featured_media":30784,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,5,32,6,8,510],"tags":[253,1291,155,60,400,109,1290,1292,552],"class_list":["post-30780","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earth-atmosphere","category-featured-articles","category-lakes-reservoirs","category-monitoring_tech-htm","category-newsfeed","category-water-quality","tag-aquifer","tag-california-seismic-network","tag-drought","tag-featured","tag-harvard-university","tag-news-ticker","tag-san-gabriel-valley","tag-seismic-velocity","tag-seismology"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"\nTracking Aquifer Water With Seismic Noise<\/title>\n<meta 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