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._ • ticismic ~1unitoring \et~~urk , !forth Fork ~•allr:~. P:uu7i:t, (•ulur:+do <br />1)bjccti~'c: :~ seismic nulnitoring array i> .1rI11mrJ to ~I•o\ ide continuuu; ntc;lwrc n(tieisntic <br />.rai\ it, in the \ icinit\ ul past. pre.ent, and ILwre long\call mining aeti\ its'. Uata is heing <br />collected to establish empirical ground moUOn relations. <br />Area Covered: The area encompassed extends east-west from Coal Creek Mesa to West <br />Tower Mountain and north-south from Terror Creek Reservov to Llon Mesa (see Figure 1) <br />The area includes the West Elk coal mine operated by Arch. Inc and the Bowie No 2 Mine <br />property of Bowie Resources LLC (BRL) Seismicity From the Elk Creek mine owned by Oxbow <br />Mm~ng, Inc ~s also recorded <br />ticismolu~) Rasics(Ucfinitinnsl <br />Illlell;ll\': ;1 Illed,ll l'e „I the i tliit~ of :1 ;l•I SI111C l•\~l'nl :II a pl,Illl CCg<IrdleSS l11 II1C 51/e 1,1'lI1C C\enl <br />or lliC d15tallie I„ the e\i 111. I Ili fe :11'e 111:111\ 171ea;llrellk ltb of Ktslllll' elleels, peak gR,lllld <br />acceleration {;unpliuuic o(Ihe lark>t hurimntal acieler:uionl is nne. <br />~laenitude: a nuasurr of the size of;1 seismic event. I here arc many ma~ninute ;ralr;: a <br />ionunon uric i. \11. the local magnitudr determined Irum the ;ei;mii n•el~rding> (intenait)' at the <br />;talion ~ and the list:uu•e to the earth,luake. <br />.- I llurrte gruuna a.ljusnnents that uirur dIII'lllg minim genertte seismic \\a\es th;d ore i;ul hr <br />Jr!eiteJ soul recurded'n\ an arra\ nl•srismie srnsurs. Neu;urcmcm of relati\e arri\al tinte5 01 <br />' _ • ~::,mic \\a\rs at di(t~rcnt seismic sultiun. I\rovides the ha.ie data nredeii to rnliulatr "e\ent.. <br />;~'iatinn;. ;1 realislie seismic \elucih model of tlx• reeiun must he con;trueted tin use in the <br />-- I,~i;Minn i;llcul:uiuns. <br />IZreurding and anahiing Dull sci5mir a;l\e(urms ullo\\; maatitudc. ur other mra.urr• of <br />arength. to hr .atim;rtrd :utd the time piston of ground nuNiuns w hr idrntilied (iruund <br />motions th;n :Irc ;bung e110UL11 ht I>.,tenlGdl\ represent a thre;lt a, enginrering stnleulres :tre <br />iallcd sUvng grounJ ntutions. Stn,ng-nn7tion srisnulgr;yths. or aecelrn,>;raphs.:ur spceitiatlh <br />drsigned to ntrasure strum, ground nx,tiun, near seismic sources. I hesr unit. nleusure thrce- <br />dintrnsionul groun\I aieelcr,niun (one \erlieal and n\u horizontal iontponentsl a, a funetinn of <br />time. Intrprttiun nt the acceleration time ;erns }'fields ground \elocitics and displacenu'ats as a <br />function ul time. Parameters 17tt charu•trriiing ground nwtiun ini•ludr peak ground acri•leratiun <br />11'1.,;~1, Teak gR~lllid \el,~ill\ IP(i~ I,IIId dt~hl;liC111CI1t IPlII11. dur:np~It „(,hllktlle.:Illd \JrH,II> <br />rrspume <hei u:: <br />_ \et\~urk ~lunilorinp (uncept: Itenu,tr. <br />._ ;i,lar-Ih,\\eI"e,l. ~eI~11L~Illi lCl';Nlllull; <br />-- i„It111Tl1u11>\ rei,\rd .lll.l Itall>Illll ;11517711' \\;I\ l'S <br />._ via radio In innlputers residing un .1 closed <br />- luial-are;l neh\urk l I.:\\ t. I~incntetrila tri:l~ial <br />.. I Ili\ensur analg-ntuliun aicelenaneters \\ith <br />.. \.Itls h ~ da1:1 rel'uriIC CS ;Ire p, ~Sllh,lled .ll Caell <br />• .i.lw~u I hi sampling rate i. Itnt samples per <br />~r:.n1J and tints is s\nehnmiied usilte (il'S. <br />