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2017-06-14T22:28:28+07:00
2017-06-14T22:28:28+07:00
2017-06-14T22:28:28+07:00
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DF'. Yudiantoro *) and Moch Muzani '-';*) Geology peparu;teni UPN "Veteran*-Yogyakarta' - --' -"i*) Geology Survey of Indonesn.AbstractMerapi rcprescnt a nature glamor amazing withthe trapeze top o,pening up at wesl This volcanooftentimcs vomit thc hcat rnaterialsuch * j*rri"tl an$ rrgt;an;-uiu!, oipyr&r*ti" flows audrock fa'lof lava. Thc crrytiorr cycle is- short enou;il'ir"t' i13"ut 1-."i y*t rtataniitttlt special attention'bccause in wery Sappc,nedby thc cruption.it'iit -*"tc humanbcing at least 40'0oo people'pyroclastic flffi;ii;J.n.r'urc.at;;. A;; 9f ,hi. giiaii'g sediment can reach the radius morethan l0 km with the tenpera-turc -or" tt un?oo .c and t uu. rp..r"i""iroo hT 4o*. This hot rnatcrialin the form of drst and ian4 the grain sizc is tilrrt 4 - o'5 "*- Gt;i" size analysis of pyroclastic flowswhich is akcn away from area is ,.* by-.ifr"i'"*gr t,r to ,t. Jog" showing pattern bimodal' theerain sizc is 4 rm: and 0.250 mnu its mean is i;;d" size is unsorted rhis sediment is effect of process[re prccipitation by turbulcnce'l. IntroductionGunung Merapi reprcs-elt the active vulcano, owning crater has diameter of 400 m2' Thiscrater is fiiled by dome of lava *a p[oti^* . fi,ir ,6t.uno is located in the middle of verypopulous are4 so ,i* ii,fr, ,*pi"t il;;;;; will menactit" 'oot of human being living aroundits. : --r:--ic.. ,.,t.i^h ^ftpn hennens is owoclasttcThe eruption threat the region argund Merap! acti'ity rvhich.often happens is pyroclasticflows. This pyrocfuoi, i, to, irtoiuirort.i. tl*k anO astt deposite' Blast of py't'clastic flowslook like the mushroom or cloud ,o1iog in t'itt'-speedly' ;th" iocal people at Merapi mention itu"wedus.gembef''accurate piroclastic flows samplas are taken residing at K Apu, K' senowo'K Lamat, K putih, K Batang, n g.u.ng,-C;dng, r iunioe ana rc.yoJo' This Sediment isdone by anarysis granuromctry *ui"i-uiri'to r[noi-th.;h;;eristic distribution grain size ofpyroclastic flows &rrir"pi, so-ttrat;;;;ril"f gruio rir*, iitt distribution and relation of grain'size, and what *lif: U* fhat characroirri.' M"ihod *J t" finish the problems is by usingstatisticar analysis methd. Samples p;;i;ii; io*r.,ur..n by rou'rr faction with the grain size;di;;;;;tt t ,ott' have diameter opening less than 4 mm'2. Geologic'settingByregionalisthisMerapilaysintheintersectionoftwofaults,thatisdirectionnorth-south and nonhwest - sor*hea$. In,i. p* "rsuminit, this faults expand, so to form the patternalmost look lfte bow in two place, ;;;{;;"a mrn Gunung of rurgo-slope of east of GunungUto with air""tlon nortfrrust.lrootfr*ii;t h; west slope oT grytlg ljo-Pusunglondon havingdirection norrh-south. The recent pr;i;;iMerapi oft.n called Gunung Anyar' This gunungreprcent the npst ylung Merapi urrJorr the activity,".ntru[y hery. Depression in the summitreprcsent the cratei iriJ oi.rrine;p ;;-J;h;;ti' Tha; form afficted bv eruption 196l 'Gt'rung Bibi is lapped or", uv r* Merapi *a tttit t.Ji*"n isthe oldest rocks' that is oldage 400.000 year ago. olrh: r9g o#iolllJ.'ititiu'*a hva are representing Ancient Merapi( 40.000-6700 ycJ o) and thir :;;i ir laid bare in i;s; hifi and P.llwanean' This Rock isassum as from prrasitic eruption. d; ;i,h" seaimeni ii precipitated Middle Merapi ( 6700-Zzly- yeuas") ;;;;.ni.t,r.rupi ( 22d0-610 .v:* ueo)' iht "t|9f-y*api is compiled bvBatulawang (order) consisted of the Lua una Gqirh*ur;gkur (more young) that have association
164
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