epyeLf;fk;
,aw;ifg; nghplh;fs; ,iwtdpd; nfhgj;jhy; Vw;gLtjhf ekJ Kd;ndhh;fs; fUjpdh;/ mwptpay; tsh;e;Jtpl;l ,f;fhyj;jpYk; XU rpy ,aw;ifg; nghplh;fisg; gw;wpf; nfl;Fk;nghJ my;yJ mit Vw;gLj;jpa nrj';fisj; bjhiyf;fhl;rpapy; fhqk;nghJ giHa epidt[fs; ekf;F kPz;Lk; Vw;gLfpd;wd/ mz;ikapy; (khh;r;R 11. 2011) $g;ghd; ehl;od; tlgFjpapy; Vw;gl;l epyeLf;fKk; mjidj; bjhlh;e;J cz;lhd fly;nfhSk; epyeLf;fk; gw;wpanjhh; g[jpa mr;rj;ij ek;kpilna Vw;gLj;jpa[s;sd/ 2004Mk; Mz;L ork;gh; 26Mk; ehs; cz;lhd ,e;jpag; bgU';fly; fly;nfhs; (Rdhkp) Vw;gLj;jpa ghjpg;g[fs; ,d;dKk; jkpHf kf;fspilna khwhj tLthf cs;sJ/
,aw;ifg; nghplh;fs; (Disaster) ,U tifg;gLk;. Kjy;tif kdpjr; bray;ghLfshy; Vw;gLgit/ nghh.; cs;ehl;Lf; fytuk;. jpOh; jP tpgj;J. mqkpd;epiya';fs;. ntjpapaw; bjhHpw;rhiyfspy; Vw;gLk; tpgj;Jf;fs; Kjypadtw;iw ,jw;F cjhuzkhfr; brhy;yyhk;/ ,uz;lhk; tif ,aw;ifahf epfH;git/ bgUbts;sk;. twl;rp. g[ay;. Nwhtsp. ,o kpd;dYld;Toa fL';fhw;W. epyr;rhpt[. epyeLf;fk;. vhpkiy btog;g[. fly;nfhs;. bfhs;is neha; Mfpad rpy Kf;fpakhd ,aw;ifg; nghplh;fshFk;/
nghplh;fSs; rpy bjhlh; epfh;t[fshYk; (chronic hazards) rpy jpOh; epfH;t[fshYk; (episodic hazards) Vw;gLfpd;wd/ bjhlh; twl;rpahy; epyg;gug;g[ ghiytdkhjy;. epyj;jpd; jd;ik khWjy;. ciwgdpg; got';fs; cUFjy; Mfpait bjhlh; epfH;t[fshy; Vw;gLk; nghplh;fshFk;/ FWfpa neuj;jpy; epfH;e;J bgUj;j nrjj;ij Vw;gLj;Jgit ,uz;lhk; tifiar; nrh;e;jit. kdpjh;fs; nghplh;fs; Vw;gLk; gFjpfspypna mjpfk; thH;fpd;wdh;/ Vbddpy; vhpkiyapypUe;J tPRk; rhk;gypdhy; mjdUfpy; cs;s epy';fs; ,aw;ifahfnt Kg;nghfk; tpisaf;Toa jd;ika[iladtha; cs;sd/ bgUbts;sk; Vw;gLfpd;w rkbtspg;gFjpfspy; cs;s epy';fs; rhFgof;nfw;w tskhd epy';fsha; cs;sd/ g[ay;fshy; ghjpg;gila[k; flnyhug; gFjpfs; bjhHpy; kw;Wk; thzpf tsh;r;rpf;F cjt[k; ey;y JiwKf';fis cilajha; mike;Js;sd/ vdnt ,g;gFjpfs; kf;fs; beUf;fk; mjpfKiladtha; cs;sd. ,g;gFjpapy; thGk; kf;fs; mwptpaypd; Jizahy; ,aw;ifg; nghplh;fshy; Vw;gLk; ghjpg;g[fisf; Fiwf;f Kw;gLfpd;wdh;/ MapDk; ,aw;ifg; nghplh;fSs; Xd;whd epyeLf;fk; ,d;dKk; mwptpayhy; bty;y Koahjnjhh; nghpluhfnt cs;sJ vd;gjid mz;ikf;fhy $g;ghd; epyeLf;fk; ekf;Fg; g[yg;gLj;JfpwJ/
cyf eythH;t[f; fHfj;jpd; (WHO-World Health Organisation) 2002Mk; Mz;L mwpf;ifg;go ,Ugjhk; Ehw;whz;oy; Mz;LnjhWk; Rkhh; 900 epyeLf;f';fs; Vw;gl;Ls;sd/ ,jdhy; Vw;gl;Ls;s bghUshjhur; nrjk; Vwj;jhH 250 gpy;ypad; lhyh;fshFk;/ 20/01/1995 $g;ghdpy; cs;s Qth$p jPtpYs;s. nfhg; (Kobe) vd;w ,lj;jpy; Vw;gl;l epyeLf;fj;jhy; kl;Lk; 131/5 gpy;ypad; lhyh; ,Hg;g[ Vw;gl;lJ/ epyeLf;f';fisr; rkhspf;Fk; my;yJ mjdhy; Vw;gLk; nghplh;fisr; rkhspf;Fk; jahh; epiyapy; ,y;yhj gFjpfspy; caphpHg;g[ mjpfkhf Vw;gLfpwJ/ vLj;Jf;fhl;lhf 2001Mk; Mz;L F$uhj;jpy; xh; epyeLf;fk; Vw;gl;lJ/ mjdhy; gyh; caphpHe;jdh;/ mfkjhghj; nghd;w bghpa efhpy; Tl fl;ol';fs; ,oe;J tpGe;J gyh; khz;ldh;/ Mdhy; mnj Mz;L mbkhpf;f If;fpa ehl;oy; mnj Mw;wYld; Toanjhh; epy eLf;fk; Vw;gl;lJ/ Mdhy; m';F fl;lg;gl;l fl;ol';fspd; juk; ed;whf ,Ue;jjhy; m';F caph;r;nrjk; mjpf mst[ Vw;gltpy;iy/
epyeLf;fj;jhy; Vw;gLk; nrj';fisj; jtph;f;f. epyeLf;fk; gw;wpa mwptpay; cz;ikfis mwpjy; mtrpak;/ ekJ Kd;ndhh;fs;. gz;ila fhyj;jpy; g[tpiag; ghk;g[fs; my;yJ ahidfs;. Mik. rpye;jp my;yJ bQh;Fyp!@ vd;w bja;tk; jh';fp epw;gjhf vz;zpdh;/ ,it mirtjhy; epyeLf;fk; Vw;gLtjhff; fUjpdh;/ fpnuf;f jj;Jt mwp"uhd mhp!@lhl;oy; Kjd; Kjyhf epyeLf;fk; gw;wp mwptpay; g{h;tkhfr; rpe;jpj;jhh;/ g{kpf;foapy; g[ija[z;Lfplf;Fk; fhw;nw epyeLf;f';fSf;Ff; fhuzk; vd mth; vz;zpdhh;/ 1750Mk; Mz;L ,';fpyhe;J Ie;J bjhlh; epyeLf;f';fshy; jhf;fg;gl;lJ/ gpd;dh; mt;thz;L etk;gh; 1Mk; ehs; "hapw;Wf;fpHik Vw;gl;l XU bghpa epyeLf;fj;jhYk;. mjd; gpd;dh; Vw;gl;l fly;nfhshYk; nghh;r;Rfy; ehl;od; yp!@gd; efunk mHpe;J nghdJ/ ,jdhy; 70.000 ngh; bfhy;yg;gl;ldh;/ ,e;epyeLf;fj;jhy; Kiwahd fz;fhzpg;g[fSld; Toa epyeLf;ftpay; vdg;gLk; (M';fpyj;jpy; rP!@khy$p) vd;w g[jpa mwptpay; Jiw njhd;wp tsh;r;rp fz;lJ/
hpf;lh; msit
epyeLf;fk; gw;wpa bra;jpfis ehk; nfl;f;Fk;nghJ. me;epyeLf;fk; hpf;lh; msitapy; ve;j mstpw;F gjpthfpa[s;sJ vd mwpa Mh;tk; fhl;Lnthk;/ rhh;y!@ g;uhd;!p!@ hpf;lh; (Charles Francis Ritcher) vd;w mbkhpf;f ehl;L epyeLf;ftpayhsh; Kjd; Kjypy; 1935,y; jdJ rf mwptpayhsuhd bgndh Tld;bgh;f;
(Beno Gutenberg) vd;gthpd; JiznahL ,jid gad;gLj;jpdh;/ ,UtUk; fypnghh;dpah ,d;!@ol;a{l; Mg; blf;dhy$papy; mt;tkaj;jpy; gzpg[hpe;J te;jdh;/ hpf;lh; jdJ ez;gUld; epyeLf;fj;jpd; tY gw;wpa Ma;t[fisj; bjhl';fpa nghJ epyeLf;fj;jpd; tYit msf;f 1902 Kjy; tHf;fj;jpy; ,Ue;j. ,j;jhypiar; nrh;e;j ghjphpahUk; epytpayhsuhYkhd n$hrg; bkh;fhyp
(Giuseppe Mercalli) vd;gtuhy; cUthf;fg;gl;l "bkh;fhyp msit" vd;w msit gad;ghl;oy; ,Ue;jJ/ epyeLf;fj;ij kf;fs; vt;thW czh;e;jdh; vd;gjpd; mog;gilapy; ,t;tsit cUthf;fg;gl;lJ/ hpf;lh; cUthf;fpa msit my;yJ mstPl;L Kiw epyeLf;fkhdpfs; je;j jut[fspd; mog;gilapy; cUthf;fg;gl;lJ/
hpf;lh; fypnghh;dpahtpy; epfH;e;j rpy epyeLf;f';fspd; tYit msf;fr; rpy epyeLf;fkhdpfis (Seismometer) epWtpdhh;/ ,e;epyeLf;fkhdpfs; epyeLf;f btsp ikaj;jpypUe;E (Epi-Center) 100 fp/kP/ Jhuj;jpw;Fs; epWtg;gl;ld/ epyeLf;fkhdpapd; 'epyeLf;f tiuglj;jpy;' (Seismograph) XU epyeLf;fk; gjpt[ bra;a[k; mjpf mst[ miytPr;rpd; (amplitude) msit ikf;nuh kpy;ypkPl;lhpy; (10-3 mm) mse;jhh;/ ,e;j mstpd; gj;jpd; klf;ifna (Lograthim based on 10) epyeLf;fj;jpd; tYthf mth; vLj;Jf;bfhz;lhh;/ gpd;dh; ,e;j hpf;lh; msit cyfpd; ve;jg; gFjpapy; epfH;e;j epyeLf;fj;ija[k;. ve;j ,lj;jpy; mikf;fg;gl;oUf;Fk; epyeLf;fkhdpapd; fzpg;g[fisf; bfhz;L tYitf; fzf;fPL bra;a[k; Kiwf;Fj; jug;gLj;jg;gl;lJ/
,e;j hpf;lh; msit gj;jpd; klf;if msitahf ,Ug;gjhy;. 7/0 vd;w hpf;lh; msit bfhz;l Xh; epyeLf;fk; 6/0 vd;w hpf;lh; msit bfhz;l epyeLf;fj;ijf; fhl;oYk; gj;J kl';Fk;. 5/0 vd;w hpf;lh; msit bfhz;l epyeLf;fj;ijf; fhl;oYk; EhW kl';Fk;. 4/0 vd;w hpf;lh; msit bfhz;l epyeLf;fj;ijf; fhl;oYk; Mapuk; kl';Fk; mjpf ghjpg;igj; juf;ToajhFk;/ hpf;lh; msitapd; mst[fSk;. me;j Fwpg;gpl;l mstpy; epyeLf;fk; Vw;gl;lhy; cz;lhff;Toa ghjpg;g[f;fSk; ml;ltiz-1,y; jug;gl;Ls;sJ/
ml;ltiz – 1
hpf;lh; msitapd; mst[fSk; - gjpg;g[fSk;
hpf;lh; msitapy; epyeLfj;jpd; typik vz; | Xuhz;oy; ruhrhpahf epfHf;Toa epyeLf;f';fspd; vz;zpf;if | epyeLf;f tpist[fs; |
3/4 Fiwthd | 80.000 | epyeLf;fkhdpfshy; kl;Lnk czug;gLk; |
3/5 Kjy; 4/2 tiu | 30.000 | tPL. fl;ol';fspDs;ns czug;gLk; |
4/3 Kjy; 4/8 tiu | 4800 | bgUk;ghyhndhh; czUfpd;wdh;. rd;dy; fjt[fs; mirfpdwd/ |
4/9 Kjy; 5/4 tiu | 1400 | midtUk; czUfpd;wdh;/ fpz;z';fs; cilfpd;wd/ jpwe;j fjt[fs; MLfpd;wd/ |
5/5 Kjy; 6/1 tiu | 500 | fl;ol';fSf;Fr; rpwpa mstpyhd nrjk;/ Rth;g;g{r;R cilfpwJ/ |
6/2 Kjy; 6/9 tiu | 100 | fl;ol';fSf;F mjpf nrjk;/ g[ifg;nghf;fpfs; cilfpd;wd/ tPLfspd; moj;jsk; efUfpwJ/ |
7/0 Kjy; 7/3 tiu | 15 | fzprkhd nrjk;/ ghy';fs; tisfpd;wd/ Rth;fspy; tphpry; njhd;WfpwJ/ fl;ol';fs; tpHf;fTLk;/ |
7/4 Kjy; 7/9 tiu | 4 | bgUj;j nrjk;/ fl;ol';fs; ,oe;J tpGfpd;wd/ |
8/0 f;F nky; | Ie;J Kjy; gj;jhz;LfSf;F XU Kiw | KGr;nrjk;/ jiu miyfs; czug;gLfpd;wd/ epyeLf;f ikag;gFjpapy; thH;fpd;w caphpdr; rKjha';fs;. Xl;L bkhj;jkhf mHpfpd;wd/ |
hpf;lh; msitapd; tifg;ghl;ow;F epyeLf;fj;jpd; nkw;g[w miyfspd; miytPr;ir hpf;lh; gad;gLj;jpdhh;/ gpd;dh; cl;g[w miyfspd; P - miyfs; vdg;gLk; Kjy; epiy miyfspd; miytPr;irg; gadlgLj;jp epyeLf;fj;jpd; typikiaf; fzf;fpLk; tifapy; ,e;j hpf;lh; msit khw;wg;gl;lJ/
glk; - 1 : hpf;lh; msit
bjhlf;fj;jpy; hpf;lh; msit bjd;-fypnghh;dpahg; gFjpapy; gad;gLj;jg;gLk; tz;znk cuthf;fg;gl;lJ/ ,k;Kiw vspikahf ,Ue;jjhy; cyfpd; gy;ntW gFjpfspYk; gad;ghl;ow;F te;jJ/ epyeLf;fk; Vw;gl;l gFjpfSf;fUfpy; mikf;fg;gl;Ls;s VnjDk; \d;W epyeLf;fkhdpfs; jUk; jfty;fs; epyeLf;fj;jpd; btspikak; (epicenter). Mjdhy; cUthd jiuaiyfspd; mjpfmst[ miytPr;R Mfpa ,uz;ila[k; mwpa cjt[fpd;wd/ ,j;jfty;fisf;bfhz;L epyeLf;fj;jpd; typikia. hpf;lh; msitapy; ehk; vspjpy; fzf;fplyhk;/
glk; 2 : epyeLf;fkhdpfs; \yk; epyeLf;f';fis mwpjy;
jw;nghJ hpf;lh; cUthf;fpa epyeLf;f msit gy;ntW khWjy;fSld; btt;ntW bgah;fspy; gad;ghl;oy; cs;sJ/ hpf;lh; cUthf;fpa 'hpf;flh; msit'. 'epyeLf;fj;jpd; jy typik msit' vd;W bghUs;gLk; tifapy; 'nyhf;fy; nkf;dpl;a{l; !@nfy;' (Local Magnitude Scale – ML) vd;W M';fpyj;jpy; tH';fg;gLfpwJ/ Mdhy; Clf';fs; vy;yh epyeLf;f msitfisa[k; 'hpf;lh; msif' vd;nw Fwpg;gpLfpd;wd/
fl;Liuahrphpah;
F/it/ ghyRg;gpukzpad; K.V. Balasubramanian,
MA(Tamil & His), M.Sc(Phy), M.Phil MA(Tamil & His), M.Sc(Phy), M.Phil,
cjtp thdpiy tp";"hdp, Assistant Meteorologist,
kz;ly thdpiy Muha;r;rp ikak; Regional Meteorological Center,
brd;id 600 006. College Road Chennai-6.