foundation system of burj al arab

Searching Faults: As Earthquake Geologic Evidence (Part-1)

As discussed in previous post, geologic evidence for earthquake hazard analysis is mainly focused on pointing out of faults. The techniques that are introduced by geologist are:

a. Remote sensing imagery (infrared photography)

b. Examining air photos

c. Reviewing published literature

d. Field reconnaissance with trench log

e. Boring and test pits

f. Geophysical 
Evidence of earthquake ground movement by rippling of rails
Evidence of earthquake ground movement by rippling of rails

Reiter suggested following features for identifying faults:


1. Indication of fracturing on the surface and clearly noticeable fractures on the surface which includes:

a. Slickensides

b. Fault gauge

c. Fault breccias

We know these terms are new to you; the explanations are 

Disruption of ground surface due to earthquake
a. Disruption ground surface

b. Evidence of ground movement

c. Both sides of fault is grinded


2. We know geologic strata are an essential portion of geologic map. We can study on such strata and look for presence of

a. Dissimilar materials

b. Repeated or missing strata

c. Truncation of structures or strata


The rest features will be discussed in next part where we will include:

a. Geomorphic and topographic indicators
Both sides of fault is grinded during earthquake
b. Secondary geologic characteristics

c. Remote sensing imagery

d. geophysical indicators

e. Geodetic indicators

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