XvKv (f„Zî½) (Dhaka City, Geology)  evsjvG`Gki ivRavbx XvKv cÉvq 400 eQi AvGM eywoMãv b`xi ZxGi MGo DGVwQj| ‰ hver cÉvµ¦ meÆ cÉvPxb gvbwPGò ˆavjvB Lvj I eywoMãv b`xi msGhvMÕ©Gj 1.5 eMÆ wKwg RvqMv RyGo XvKv knGii AeÕ©vb ˆ`LvGbv nGqwQj| 1904 mvGj ZrKvjxb weËwUkivR KZ‡ÆK XvKvGK cƒeÆeGãi ivRavbx ˆNvlYvi ci ˆ^GK eÅvcK bMivqY ÷i‚ nq| 1947 mvGj cƒeÆ cvwKÕ¦vGbi ivRavbx nIqvi ci XvKv gnvbMixi ghÆv`v cvq ‰es ZLbB bMixi eÅvwµ¦ cÉvq 40 eMÆ wKwg nq| ZGe 1971 mvGj Õ¼vaxb evsjvG`Gki ivRavbx nIqvi ci XvKv knGii ài‚Z½ AZů¦ e†w«¬ cvq| ‰i dGj bMixi AvqZb eÅvcKfvGe mÁ·ÉmvwiZ nq ‰es 1991 mvGji Av`g÷gvix Abyhvqx XvKv gnvbMixi ev XvKv ˆgGUÇvcwjUb ‰jvKvi  AvqZb nq 1600 eMÆ wKwg I RbmsLÅv cÉvq 68 jÞvwaK| ‰KB ÷gvwiGZ XvKv wmwU KGcÆvGikGbi ‰jvKv aiv nq 360 eMÆ wKwg ‰es RbmsLÅv cÉvq 30 jÞvwaK| XvKv ˆgGUÇvcwjUb ‰jvKvi eZÆgvb RbmsLÅv cÉvq 90 jÞ|

XvKv 23°42´ I 23°54´ Dîi AÞvsk ‰es 90°20´ I 90°28´ cƒeÆ `ËvwNgvsGk AewÕ©Z| ‰B bMixi `wÞGY eywoMãv, cwøGg ZzivM, cƒGeÆ evjy I DîGi UãxLvj AewÕ©Z| ‰LvGb myÕ·Ó¡ FZz wZbwU  kxZKvj (bGfÁ¼i-ˆdeË‚qvwi) 10° ˆ^GK 20°ˆm Zvcgvòvi gGaÅ ÷Ó• AvenvIqv wewkÓ¡, cÉvK&-elÆvKvj (gvPÆ-ˆg) K`vwPr e†wÓ¡ I 4°ˆm chƯ¦ Zvcgvòv e†w«¬ ‰es elÆvKvj (Ryb-AGÙvei) AZů¦ Av`ËÆ ‰es Zvcgvòv 30° ˆmjwmqvGmi gGaÅ| XvKvq eQGi cÉvq 2000 wgwg chƯ¦ e†wÓ¡ ˆiKWÆ Kiv nGqGQ hvi 80 kZvskB elÆvKvGj msNwUZ nq|

eywoMãv b`xi Dîi ZxGiB cÉavbZ XvKvi bMivqY mxwgZ| XvKv bMixi Pvik eQGii BwZnvmGK D®²qGbi 5wU wf®² wf®² chÆvGq fvM Kiv hvq, ˆhgb: cÉvK&-gyMj Avgj (1608 mvGji cƒGeÆ), gyMj Avgj (1608-1764), weËwUk Avgj (1764-1947), cvwKÕ¦vb Avgj (1947-1971) I evsjvG`k Avgj (1971 ˆ^GK)|

f„Zvwî½K ˆcÉwÞZGK weGePbvq bv ‰Gb XvKv knGi `Ë‚Z bMivqGYi KviGY bMi ‰jvKvi f„-cwiGeGk (geo-environment) ài‚Z½cƒYÆ cwieZÆb ‰GmGQ| Rjve«¬Zv, `ƒlY, RjZvwî½K eÅeÕ©vq cwieZÆb, Õ©vb weGkGl f„wgi Aebgb I feb a»Gm cov ‰me mgmÅv f„-cwiGek msò×v¯¦ cwieZÆGbi mGã RwoZ eGj aviYv Kiv nGq ^vGK| weMZ 30 eQGi f„MfÆÕ© cvwb DGîvjb 900 kZvsGki ˆewk e†w«¬ ˆcGqGQ hvi dGj f„MfÆÕ© cvwbi Õ¦i 20 wgUvi wbGP ˆbGg ˆMGQ| wk͸-KjKviLvbv I ˆcŒi KvGRi `ƒwlZ eRÆÅ bMixi wfZGi I ‰i AvkcvGk hòZò Rgv Kiv ‰es wbPzf„wg I cÉvK‡wZK Lvj-bvjvq wbÓ•vwkZ nIqvq XvKv knGii cvwb mÁ·` `ƒwlZ nGœQ|

f„Zî½ (geology)  XvKv gaycyi Mo bvGg cwiwPZ µÏvBmGUvwmb ˆmvcvGbi meÆ`wÞY cÉvG¯¦ AewÕ©Z| `ywU f„Zvwî½K BDwbU bMi I ‰i Avkcvk ‰jvKvGK wNGi AvGQ| ˆhgb- µÏvBmGUvwmb hyGMi gaycyi K`Æg I mvÁ·ÉwZK KvGji cwjR AeGÞc| gaycyi K`Æg kniwUi wfZGi I evBGi cÉKwUZ meGPGq cÉvPxb AeGÞc| XvKvi iGqGQ ŠewkÓ¡ÅgwíZ f„-cÉK‡wZ I cvwb wbÓ•vkb eÅeÕ©v| bMixi DGÍÏLGhvMÅ f„-cÉvK‡wZK BDwbUmgƒn nGœQ: DœPf„wg ev XvKv ˆmvcvb, wbÁ²f„wg ev µÏvebf„wg, Lv` ‰es cwiZÅî× Lvj| XvKv knGii AbÅvbÅ DGÍÏLGhvMÅ f„-cÉvK‡wZK ŠewkÓ¡Å nGjv ivRavbxi wfZi I wbKUeZÆx ‰jvKvmgƒGn wbÁ²Rjvf„wg I Lvjwej ‰es cÉvK‡wZK nË` ˆhgb avbgw´£ I àjkvb ˆjGKi AeÕ©vb|

XvKvq 300 wgUvi MfxiZv chƯ¦ A¯¦tf„-c†Ó¤ cvjwjK Õ¦iò×g ˆ^GK wZbwU myÕ·Ó¡ f„Zvwî½K ‰KGKi AwÕ¦Z½  aiv cGo, h^v- µÏvBmGUvwmb hyGMi gaycyi K`Æg Õ¦imgwÓ¡| cwj I AwZ wgwn evjyKYv mnGhvGM jvjvf AvVvGjv (plastic) Kv`v ‰i ŠewkÓ¡Å| gaycyi K`Æg Õ¦imgwÓ¡ gvSvwi ˆ^GK ˆgvUv njy`vf ev`vwg evjy I gvGS gvGS bywoGZ MwVZ µÏvGqv-µÏvBmGUvwmb hyGMi Wzwc wUjv Õ¦imgwÓ¡i Dci AmsMZfvGe AwakvwqZ| bMi ‰jvKvi wfZGi ˆLvw`Z Lvj I Lv`mgƒGni ZjG`k mvÁ·ÉwZK cwjR µÏvebf„wg AeGÞGc cƒYÆ hv Avevi wbÁ²f„wg cjj I DœPf„wg cjGj wefî×|

f„Zvwî½K KvVvGgv I ŠiwLK wPi (structure and lineament)  XvKv gnvbMi ‰jvKvq ˆKvb f„-c†Ó¤ fuvR cwijwÞZ nq bv| ZGe wegvb ˆ^GK M†nxZ AvGjvKwPGòi eÅvLÅvq ‰es b`b`xi MwZcÉK‡wZ ˆ^GK Dîi-`wÞY, cƒeÆ-cwøg, DîicƒeÆ-`wÞYcwøg I Dîicwøg-`wÞYcƒeÆ w`K cÉeYZvwewkÓ¡ AmsLÅ PzÅwZ I ŠewkÓ¡ÅmƒPK ˆiLv aiv cGoGQ| bMixi PviwU w`KB eo eo PzÅwZ «¼viv ˆewÓ¡Z|

f„KÁ·b I be-f„MVb cÉwò×qv (seismicity and neotectonics)  f„wgKGÁ·i Avkâv I ÞqÞwZi mÁ¿veÅ ZxeËZvi wfwîGZ evsjvG`kGK wZbwU f„KÁ·bxq AçGj fvM Kiv nGqGQ| cÉwZwU ˆkÉYxwebÅvGm XvKv kni I ‰i AvkcvkGK f„KÁ·bxq Açj-2 A^Ævr gvSvwi SzuwKcƒYÆ Açj wnGmGe aiv nGqGQ| ˆek wKQy MGelK XvKv I msj™² AçGji be-f„MvVwbK wePjGbi K^v DGÍÏL KGiGQb| gaycyi DœPf„wg MVbMZfvGe ˆ`Gki DœP Açj hvi gGaÅ XvKv-Uãx eÐKwU meGPGq DwïZ Ask| ‰B MGoi `wÞY, cwøg I cƒeÆ mxgv¯¦àwj avcPzÅwZ «¼viv wPwn×Z|

f„-KvwiMwi ŠewkÓ¡Åmgƒn (geotechnical characteristics)  XvKv kni I ‰i AvkcvGki gaycyi K`ÆGgi f„-KvwiMwi ŠewkÓ¡ÅmgƒGn evqexq I DÍÏÁ¼ Dfqw`K w`Gq eÅvcK wf®²Zv iGqGQ| gƒjÅvwqZ gvcKvwVàwj weGkl KGi ‰i Kg kwî× I DœP msGKvPbkxjZv àY ˆ^GK aviYv Kiv nq ˆh ‰B gvwU wKQyUv nGjI cÉGKŒkwj wbgÆvGYi RbÅ mgmÅvmsKzj| Av`ÆËZvi cwigvY I µÏvwÕ¡K mxgvi djvdGj ˆ`Lv ˆMGQ gaycyi K`Æg mvaviYZ ‰uGUj ˆ^GK AwZ ‰uGUj cÉK‡wZi| ‰B gvwU Õ¼vfvweK ˆ^GK mwò×q ‰es gaÅg ˆ^GK DœP µÏvwÕ¡K gvbmÁ·®²| ‰B msGKvPbkxjZv àY ˆ^GK aviYv Kiv hvq ˆh, ‰B gvwU wf®² wf®² Õ©vGb Lye Kg ˆ^GK AwZgvòvq msGKvPbkxj|

RjZî½  (hydrogeology)  XvKv gnvbMixi cvwbi cÉavb Drm nGœQ Wzwc wUjv Õ¦imgwÓ¡i evjygq RjÕ¦i| gaycyi K`Æg 8 ˆ^GK 45 wgUvi (MGo 10 wgUvi) cyi‚Z½ wbGq ‰B RjÕ¦Gii Dci AwakvwqZ| ‰B RjÕ¦Gii cyi‚Z½ 100 ˆ^GK 200 wgUvGii (MGo 140wg) gGaÅ IVvbvgv KGi| bMixi gaÅfvGM 26 ˆ^GK 30 wgUvi MfxiZvq f„MfÆÕ© cvwb cvIqv hvq| knGii cÉv¯¦fvGM A¯¦tf„Rjc†Ó¤ nGjv 15 ˆ^GK 20 wgUvi MfxGi| eZÆgvGb Wzwc wUjvi evjy b`x ZjG`k eivei cÉKwUZ nIqvi KviGY cÉvw¯¦K b`xmgƒn cybtmçviGKi Drm wnGmGe KvR KGi| cybtmçviGKi AbÅvbÅ Drmmgƒn nGœQ e†wÓ¡ I ebÅvi cvwbi DÍÏÁ¼ AbymËeY, cvwb mieivGni cvBc I cqtcÉYvjx eÅeÕ©v ˆ^GK wbtmiY ‰es bMixi wÕ©i Rjgnvj ˆ^GK wbtmiY|  [wmdvZzj KvG`i ˆPŒayix]