ÖNCEL AKADEMİ: INTRODUCTION TO SEISMOLOGY

Department of Earth Sciences KFUPM Introduction to Seismology Earthquake Occurrence 2 Introduction to Seismology-KFUPM Ali Oncel [email_address]

Previous Lecture ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Introduction to Seismology-KFUPM

Recall: MAGNITUDE OCCURRENCE ,[object Object],log 10 N c (m>M) = a - bm ,[object Object],[object Object],m 1 = a/b [i.e. N c = 1] Introduction to Seismology-KFUPM b= β x log e log e=0.4343

Seismicity of Stable Cratonic Cores (SCC) Fenton, Adams, Halchuk, 2006

Earthquake catalogue completeness Introduction to Seismology-KFUPM

Magnitude-Frequency (per 50.7 x 106 km 2 ) plot for the worldwide SCC seismicity data set Introduction to Seismology-KFUPM

Stable Craton Introduction to Seismology-KFUPM log 10 N c (m) = 3.68 – 0.947 m Once a decade a M6.5

Worldwide rates of stable cratonic core seismicity Introduction to Seismology-KFUPM

Introduction to Seismology-KFUPM

stable west east 2002 Plattsburgh NY

stable west east Introduction to Seismology-KFUPM

There are several online catalogs of earthquakes. In this exercise, you will need to access one of these. For earthquakes any place in the world, a good place to start is: http://wwwneic.cr.usgs.gov/neis/epic/epic.html A catalog of focal mechanisms (CMT Solutions) is at the Harvard seismology site: http://www.seismology.harvard.edu/ You will need to use an Excel spreadsheet to solve some of these problems. Homework on Earthquake Search due May, 3 ,[object Object],[object Object],[object Object],[object Object],2. Present your data, giving the average number of earthquakes per year and establish Log N= a – b M . 3. By consulting the Harvard catalog of moment tensors, for the largest of the events in this region, infer the main tectonic process in this region. Explain the reasoning behind your response. Introduction to Seismology-KFUPM

Quiz 4 ,[object Object],[object Object],Introduction to Seismology-KFUPM Log N

ÖNCEL AKADEMİ: INTRODUCTION TO SEISMOLOGY

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