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  SEISMIC MICROZONATION  
 

Seismic Microzonation is defined as the process of subdividing a potential seismic or earthquake prone area into zones with respect to some geological and geophysical characteristics of the sites such as ground shaking, liquefaction susceptibility, landslide and rock fall hazard, earthquake-related flooding, so that seismic hazards at different locations within the area can correctly be identified. Microzonation provides the basis for site-specific risk analysis, which can assist in the mitigation of earthquake damages.In most general terms, seismic microzonation is the process of estimating the response of soil layers under earthquake excitations and thus the variation of earthquake characteristics on the ground surface.

Our research work focuses on the following regions:

 
 

Guwahati City | Sikkim Himalaya | Bangalore City | Delhi City | Kolkata City

  SEISMIC HAZARD ANALYSIS
 

Seismic Hazard Analysis involves the quantitative estimation of ground shaking hazards at a particular area. Seismic hazards can be analyzed deterministically as and when a particular earthquake scenario is assumed, or probabilistically, in which uncertainties in earthquake size, location, and time of occurrence are explicitly considered . A critical part of seismic hazard analysis is the determination of Peak Ground Acceleration (PGA) and response acceleration (spectral acceleration) for an area/site. Spectral acceleration (Sa) is preferred for the design of civil engineering structures. It is an accepted trend in engineering practice to develop design response spectrum for different types of foundation materials such as rock, hard soil and weak soils. Analysis of lineaments and faults helps in understanding the regional seismotectonic activity of the area. Lineaments are linear features seen on the surface of earth which represents faults, features, shear zones, joints, litho contacts, dykes, etc; and are of great relevance to geoscientists.

The following steps are carried out generally for seismic hazard evaluation:

1. Seismic source zonation
2. Earthquake reccurence study
3. Strong ground motion prediction
4. Assesment of hazard in terms of probablity of (non) execedence.
The last step is exclusive for probablistic assesment. The scenario based assesment has been scheduled for SIKKIM HIMALAYA, GUWAHATI CITY, GUJRAT, KOYANA WARNA REGION and JABALPUR CENTRAL INDIA.

  SEISMIC VULNERABLITY & RISK ASSESMENT
 

Risk is the expected number of lives lost , person injured, damage to property and disruption of economic activity due to a particular natural phenomenon and consequently the product of specific risk and elements at risk.

Vulnerablity is the degree of loss to a given element at risk or set of such elements resulting from the occurence of a natural phenomenon of a given magnitude and expressed on a scale from 0.0 to 1.0.

SEISMIC RISK= SEISMIC HAZARD * VULNERABLITY

 
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