Site Characterization and Seismic Vulnerability Studies of greater Shillong Meghalaya

Mande jelgipa songjinmarango banggriani sokna altuanikode biap ba jolo banggriani baririkaniko toe niachi, a∙ani moani bewal aro ta∙raka ta∙rakgijani aro uni wilwilao donggipa rikgimin nokrang aro songdongenggipa manderangna baditana nangchakea uarangko niachi ma∙sina man∙a. Ta∙rakbatroroani a∙selara a∙a-ni rokkomosa pangchakama ma ukora salni re∙ruraani baksa apsan nanggrimatna man∙genma uarangna site response parameter-rangko jakkalenba biapko ma∙sie ra∙na man∙gen. Aa∙ni bewalko noksa sale poraie niachiba rikgimin nok ba bang∙bea building-rangni nosto ong∙na altuaniko ma∙sina gita man∙a. Batanggimin bilsirangoni North East India-ni A∙dokni Skotong Songjinmarango mande jelroroani aro bading-chiwalanirangni baririkrikaniko nikna gita man∙aha. Seismic zoning map of India-o mesoka gita North East India-ara a∙selo ga∙akna altugipa zone V-o ga∙aka. Unbaksanaba, ia a∙selara bang∙bea nanggrimgipa bakrang gnang aro chang∙gni dalbegipa bangrianiko batanggimin 1897 aro 1950 bilsirango nikna gita man∙aha. Banggrianirang ong∙na altuaniko mongsonggipa ong∙e ra∙enba, North East India-ni mande jelgipa jilarango aro songjinmarango seismic micro zoning procedure-ko ra∙gatna nangchongmota. 

Iako mongsonggipa ong∙e ra∙enba, Council of Scientific and Industrial Research (CSIR), North East Institute of Science & Technology (NEIST), Jorhat aro Meghalaya Sorkarini, Department of Revenue & Disaster Management apsan bakrimenba Greater Shilllong biapko poraina aro banggriani sokna altuaniko poraina gita janapaha. Poraianiko dakna gita project-ni chu∙gimik koros-ara tangka gong ` 70.05 Lak ong∙a, uoniko CSIR-NEIST, Jorhat tangka gong 50.25 Lak-ko on∙aha ao bangki dongkuenggipa tangka gong 19.80 Lak-kode Meghalaya Sorkarini, Revenue & Disaster Management on∙skagen. Project-ni somoi bilsi 2 ong∙a. Implementing agency-ara CSIR-NEIST, Jorhat ong∙gen aro Co-ordinating agency-ara Meghalaya Sorkarini, Department of Revenue & Disaster Management ong∙gen.

Ia janapgimin poraiani mangsonganirangko indake kan∙dike sena man∙gen -

• Base map aro thematic map-rangko jakkalani jekai geology aro geomorphology, lithology, a∙mang aro kam ka∙ani rokkomrang, seismicity aro seism tectonics, a∙ningo donggipa chi aro hydrogeology, a∙a jakkala/biapo baditana a∙a-chirang gnang, biapo baditana buringrang donga, bewal aro songdongani aro songdonggipa manderang badita bang∙a uarangko nina remote sensing aro GIS tool-ko jakkalani.
• Shillong songjinmani 305-500 Km radius-ko man∙gope seism tectonics map-ko tariani aro local/global seismic network data-ko jakkalani, active tectonic lineament-ko ma∙sie ra∙ani.
• Geotechnical sandie nianirangko dakani aro poraiani, SPT borehole aro 30m ning∙tue n value-ko donggipa borehole data-oniko jeon geographical aro geological dingtanggrikanirangko man∙gope bakrimanirangko jakkalenba shear wave velocity-na spatial variation-ni mongsonganiko niani jechin liquefaction ong∙na amaniko u∙ina man∙gen. 
• Noise survey-ni apsan chel∙grikgipa line aro tongtong sronggipani gisepgriko Fourier spectra-ni ratio-chi bilo batgipa frequency unbaksanaba mesokgipa site-rangko niani.
• Shillong-na seismic site amplification-ko ong∙katatna gita data liquefaction, ong∙na altuani, local geology, hydrogeology, seismicity aro seism tectonic, geotechnical data-ko local seismic site amplification aro a∙a jakkalani bewal geographical information system (GIS) baksa nanggrimatani.

Work Plan  

• Shillong Songjinma aro uni wilwilao donggipa 250 sq km a∙ako bak bak dake map ka∙na janapaha (site amplification, a∙a moa ta∙rakani aro basement contour). Mongsonggipa a∙ani bimang ba rokkom, biapni bimangrang aro mandeni tarigimin aro rikgiminrangko field wene niachi, geo coded gnanggipa satellite noksrangko jakkalachi aro basement-o tarie donachi ma∙sie ra∙a
• Songjinmani geological/geomorphologic map-ko jeon a∙ani dingtang dingtang bimang aro rokkom, ro∙ongrangni rokkom aro geomorphic dingtanggrike mesokanirangko on∙achim uarangko 1:2 25,000 map-rango chimongani.
• Topographic map/base map-o baseman∙gimin apsananggipa grid point-rangko jakchi ra∙bitna man∙gipa GPS-ni dakchakanichi filed-o ma∙sie ra∙gen.
• Chu∙gimik ge 150 station-rang/sampling point-rangko (0.5 oni 1km ona grid interval nambata) site amplification aro basement contour map-na chanchienga.
• Site amplification-na data-ko ra∙aniko (continuous modes/100sps) ge 4-5 weak motion seismographic-rangko watate ja 4-6 ni gisepon matchotgen.

Litho logy, grid-ni chona dal∙ani, chi ning∙o skonggipa, aro chi-ni tu∙ani, n-value aro gipin engineering bakrangni bidingo u∙ianirangko man∙a gita gnanggipa geotechnical data-ko chimongani.