Monday, February 20, 2017

Download Geoscience Books

Geoscience Books:

We are grateful to Qazi Sohail Imran for providing Geoscience books to our community. Qazi is from Islamabad Pakistan and is a Former Research Geophysicist at King Fahd University of Petroleum and Minerals. He is contributing to his oil and gas community with the believe that "Knowledge is power and knowledge shared is power multiplied".Follow the link above the images to download the books. However if the link is not working or you have any other query, just mention it in comment or email us here , we will fix it for you.

1. Name: Sedimentology and Stratigraphy by Gary Nichols 
Download Here

2. Name: Physical Geology- Earth Revealed. 9th Edition by C.C. Plummer   
     Download Here


3. Name: An Introduction to Structural Geology and Tectonics by Stephen Marshak
    Download Here

4. Name: 3-D Structural Geology by R.H.Groshong
     Download Here

5. Name: Structural Geology of Rocks & Regions 3rd Edition - Davis Reynolds
     Download Here

6. Name: Geological Field Techniques Edited By Angela L. Coe
    Download Here

7. Name: Seismic Stratigraphy, Basin Analysis and Reservoir Characterisation_Vol37       by Paul C.H. Veeken
    Download Here

8. Name: General Dictionary of Geology by Alva Kurniawan, John Mc. Kenzie,                  Jasmine Anita Putri
    Download Here

9. Name: The Handy Geology Answer Book
   Download Here

          

10.   Name: Sedimentary Basin Formation-Presentation
        Download Here

11. Name: Facies Models Response to Sea Level Change by Walker and James
       Dowload Here


12. Name: AAPG Memoir 33 - Carbonate Depositional Environments
      Download here

13. Name: Petroleum Formation and Occurrence by Tissot, B.P. and Welte, D. H        Download Here

14. Name: Basin Analysis-Principles and Applications by Allen     
       
Download Here

                

15. Name: Sedimentary Rocks in the Field by Tucker
         Download Here


16. Name: Exploration Stratigraphy 2nd Edition - Visher
      Download Here

17. Name: Petroleum Geology of Pakistan by Iqbal B. Kadri
      Download Here

18. Name: The Geological Interpretation Of Well Logs by Rider
      Download Here


19. Name: Digital Signal Processing Handbook by Vijay K. Madisetti
      Download Here

20. Name: AAPG Memoir 88 - Giant Hydrocarbon Reservoirs of the World                           Download Here

21. Name: Deep-Water Processes and Facies Models-Implications for Sandstone               Reservoirs by  Dr. Shanmugam
      Download Here

               
      

Friday, February 17, 2017

Earthquake Precursors: Signs Before Earthquakes



Earthquake prediction is the ultimate goal of seismologists. Being able to predict when and where an earthquake will occur could save thousands, if not hundreds of thousands, of lives, over the years. Even after decades of study, earthquake forecasting remains notoriously difficult, however. So what are the signs which occur b
efore 
an earthquake – earthquake precursors – and how useful are they?




About the author (who writes this article): Nusrat Kamal Siddiqui is one of the leading Geoscientists from Pakistan. He has a diverse professional career of being a Petroleum Geologist, Hydrologist and Engineering Geologist, both in Pakistan and overseas. He recently published a book " Petroleum Geology, Basin Architecture and Stratigraphy of Pakistan". Click here for further details about the book.


The Precursors

There are some long-term, medium-term and short-term precursors of seismic activity that cause earthquakes.

The long-term precursors are based on statistical studies and the prediction is probabilistic. The medium-term precursors help in predicting the location of an earthquake to a sufficient degree of accuracy. The short-term precursors of seismic events are indicated by changes in geomagnetic field, changes in gravity field, rising of subsurface temperature and rise in ground radioactivity. Agriculture institutions record subsurface temperature at 20, 50 and 100 cm depth as it is useful for monitoring crop growth. In earthquake-prone areas the temperature starts rising about 700-900 days before the event. This readily available data can be of help.

The short-term precursors are more important as they can be observed by a common man, and happen from a few days before the earthquake to just before it happens. With a reducing lag time these are: rise in water in the wells with increased sediments, sudden increase and decrease in river water flow, disturbance in the reception of radio, television, telephones, water fountains on the high grounds, strange behavior of animals, a sudden jump in the number of deliveries in hospitals and malfunctioning of cell phones. These days cell phones are the most handy and common piece of electronic equipment. A general collapse of this system can be noted by masses, and hence could be a very effective means to take timely mitigation measure. It has been found that about 100 to 150 minutes before the earthquake the cell phones start malfunctioning. However, the humans are very careless by nature and there would be only very few who would be observant enough to note the above precursors.  



It is indeed believed that animals exhibit unusual behavior before an earthquake


In the earthquake-prone areas groups of observant and responsible people (including women - they normally haul the water) may be constituted wherein the list of precursors, in local languages, may be distributed and some training imparted. And this exercise may not 
be left to the authorities, for obvious reasons!

Source: Earthquakes are inevitable, Disasters are not– Mitigation, therefore, is better than Prediction by Nusrat K. Siddiqui



Suggested Readings:

1. A systematic compilation of earthquake precursors
2. Earthquakes: prediction, forecasting and mitigation
3. Earthquake Prediction, Control and Mitigation