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<br />~ockfalls are caused by the loss ot support tram underneath <br />or detachment trom a larger rOCk mess. The tall may be <br />shrted by Ice <ledglng, root gro.th, or ground shaking, as <br />..ell as a 105S of support through erosion or chemical <br />..eather Ing. <br /> <br />Consequences <br />Rockfalls can demoliSh structures and kill people. Rocks <br />failing on hlgh..ays may strike ...ehlcles, block trafflc, cause <br />accidents, and sometimes damage the road. A minor but costly <br />conseQuence is the <lork of clearing hlgh.ays and borrO<l <br />dItches In rocktal I areas. Any structure In the path of a <br />large rockfall Is subject to damage or destruction. <br /> <br />Aggravating Circumstances <br /> <br />~dn's activities otten cause rOCkS to fal I sooner than they <br />.ould naturally. E:otcavetlons Into hili and mountainsides <br />tor hlgh..ays and buildings freQuently aggra...ate rocktal Is. <br />Ylbratlons tram passing trains or blasting can trigger them, <br />as can changes In surf3ce and ground ...ater conditions. <br />Kocklells have been attributed to earthquakes and sonic <br />booms. <br /> <br /> <br />.. <br /> <br />" - -~ <br />-~....r- -=';:~ <br />~ """ roe <br />--<' ... <br />0-' _ r,_ <br />, '.... i-' <br />~..... ' .~..' I~'I I <br />_'~' ,IIIII!l ~'~.. .~~~".. <br />.......... - ''--'' <br />.~~.. 'r:;IJI: <br />.~ -----:;:,,-.~ <br />-"~-"""- - -"-~- <br />--',.~ ,~ ;~ ' <br /> <br />, <br /> <br />= <br />.._ -""L. <br />-:-:':'---:F ;:::~ <br /> <br />_:.#j;.,-. ~ <br />- - <br /> <br />This set ot photos sho.s "here a rock the size of a small car <br />came to rest after roiling do...n e hogback south"est 01 <br /> <br />~ <br /> <br />- <br /> <br />- <br /> <br /> <br />~... <br /> <br />Denver. ROCkfalls and slides are a factor in mountainside <br />deve I opmen t . <br /> <br />31 <br />