Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
seminar surveyer
Active In SP

Posts: 3,541
Joined: Sep 2010
01-01-2011, 11:53 AM

.pptx   EARTHQUAKE.pptx (Size: 597.57 KB / Downloads: 215)

What is Earthquake?
An earthquake (also known as a quake, tremor or temblor) is the result of a sudden release of energy in the Earth's crust that creates seismic waves.

Seismic loading means application of an earthquake-generated agitation to a structure. It happens at contact surfaces of a structure either with the ground, or with adjacent structures, or with gravity waves from tsunami.

Seismic loading depends, primarily, on:
Anticipated earthquake's parameters at the site
Geotechnical parameters of the site
Structure's parameters
Characteristics of the anticipated gravity waves from tsunami (if applicable).

Material selection to combat seismic loading
Calculate the dead load of the building using a specific material being used for the structure.
Calculation of the base shear- essentially the total lateral force assumed to be delivered to the base of the building.


The Roof
The roof of your property will be the first part of the house that is damaged. However, if your roof is made from concrete or clay tiles they will respond better in the event of an earthquake. If your roof has been damaged in an earthquake, hire a contractor and specifically request that the roof is repaired or reconstructed out of one of these materials. 

House Height
Earthquake research has found that houses with a single storey cope better with the forced shaking which an earthquake will subject your home to. Multi-levels houses can be built to resist earthquakes but they need to be built with reinforced concrete or built on base isolation pads.

seminar ideas
Super Moderator

Posts: 10,003
Joined: Apr 2012
19-06-2012, 03:42 PM


.pptx   EARTHQUAKE DETECTION .pptx (Size: 2.09 MB / Downloads: 100)


Electromagnetic Waves

FM stands for frequency modulation.

Usually the bandwidth of FM lies within 88MHz -- 108MHz.

VHF (Very High frequency) range is from 30MHz to 300MHz and fm uses this range.


VHF propagation is called Space wave propagation.

Space wave propagation has two components-(a)Direct component,
(b)Indirect or ground reflected component.

Direct component is propagated by two methods
(a)Line of sight propagation:-Limited by Curvature of Earth and Height of transmitting and receiving antennas.
(b)Scatter propagation:-occurs in ionospheric E-layer due to blobes of air mass and from the ionized trials of meteors ,geomagnetic field variation etc.

Usually the VHF wave penetrates the ionosphere and are lost , but due to the high concentration, electrons and ions in the E-layer having vibration frequency greater than the frequency of FM waves scattering occurs.


Radio echo used to appear one to several times in a day and before two to three weeks of earthquake occurrence. After two to nine days from the last appearance of echo earthquake have occurred.
High density plasma in ionosphere E layer over the epicenter before and after earthquake.
A co-seismic EM phenomenon has been detected in VHF band.
The VHF emissions have been continued for about three hours, after the seismic wave.

The starting times of VHF emissions corresponded to arrival times of seismic P- and S-wave, respectively.

Forecast of focus location

Each receiver is assumed to have a sensitivity region.
Mainly depends on CD component.
When CD anomalies or CDS anomalies are observed by receiver, sensitive region contain the foci of future earthquake .
BT anomalies are observed if the foci of the future earthquake is out of the sensitive regions.
BTS anomalies are observed by vicinal receiver in the case the foci of the future earthquake is located close to the border of the sensitive region.
The time constant of CD component is about 5-10 min for underground earthquake. Time constant is about 1-2 min when foci of future earthquake is located closer to the sea-shore
Therefore the focus location of future earthquakes can be forecasted from the distribution of CD dominance and BT dominance.


Important Note..!

If you are not satisfied with above reply ,..Please


So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Tagged Pages: seminor about earth quak, earthquake detection alarm,

Quick Reply
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  Earthquake Safety ppt seminar flower 1 790 20-05-2013, 04:47 PM
Last Post: study tips
  Earthquake Resistant Building Construction seminar tips 0 738 24-01-2013, 04:40 PM
Last Post: seminar tips
  HAITI EARTHQUAKE REPORT seminar flower 0 369 30-10-2012, 01:40 PM
Last Post: seminar flower
  Traditional Earthquake Safe Housing Practices of North East India seminar tips 0 411 10-10-2012, 05:20 PM
Last Post: seminar tips
  EARTHQUAKE ppt seminar ideas 3 1,840 18-09-2012, 04:27 PM
Last Post: seminar flower
  Earthquake Precautions PPT seminar flower 0 656 07-09-2012, 12:35 PM
Last Post: seminar flower
  Earthquake Hazards and Seismic Design seminar ideas 0 466 25-07-2012, 01:13 PM
Last Post: seminar ideas
  EARTHQUAKE RESISTANT STRUCTURES seminar flower 0 828 29-06-2012, 12:25 PM
Last Post: seminar flower
  GENERAL CONCEPTS OF EARTHQUAKE RESISTANT DESIGN seminar ideas 0 469 02-06-2012, 04:35 PM
Last Post: seminar ideas