1. Mohorovicic Discontinuity- The Bed of Earth Quakes?
Atula Senaratne, Ph.D.
Professor of Geology
University of Peradeniya
Sri Lanka

2. Seismicity Research in Sri Lanka
S.B.S.Abeykoon, micro seismicity
A.Senaratne et al, 2012 Planetary influence
A.Senaratne et al, 2013 Recurrence
Lack of interest among Sri Lankan Geologists

3. SEISMIC DATA SOURCES
The National Geophysical Data Center (NGDC), located in Boulder, Colorado, is a part of the US Department of Commerce (USDOC), National Oceanic & Atmospheric Administration (NOAA), National Environmental Satellite, Data and Information Service (NESDIS). We are one of three NOAA National Data Centers.
NGDC's Mission is to provide long-term scientific data stewardship for the Nation's geophysical data, ensuring quality, integrity, and accessibility.

4. NGDC provides stewardship, products and services for geophysical data describing the solid earth, marine, and solar-terrestrial environment, as well as earth observations from space. 
NGDC's data holdings currently contain more than 400 digital and analog databases, some of which are very large. As technology advances, so does the search for more efficient ways of preserving these data. 

5. NGDC works closely with contributors of scientific data to prepare documents and reliable data sets.
NGDC welcomes cooperative projects with other government agencies, nonprofit organizations, and universities, and encourage data exchange.  NGDC's data users are
private industry
universities and other educational facilities

6. research organizations
federal, state, and local governments (US)
governments, industry, and academia
publishers and other mass media
the general public
The Data Center continually develops data management programs that reflect the changing world of geophysics. National Geophysical Data Center  NOAA, Mail Code E/GC  325 Broadway  Boulder, CO   Phone: (303) , FAX: (303)

7. Available Earthquake Data
Year Mo Dy Hr Mn
Sec
Country
Lat.
Long.
Depth
Mag.
1900 1 11 9 7
JAPAN: SEA OF JAPAN
36.5
133.5
7.8 20 6 33 30
MEXICO
-105 10
7.4 5 16 12
MEXICO: NEAR COAST OF JALISCO 60 21 52
CUBA
-80
7.9 29 59
SOLOMON ISLANDS: SANTA CRUZ ISLANDS
-10
165
7.6
PAPUA NEW GUINEA: BISMARCK SEA -4
152
6.8 18
COLOMBIA
4.6
-74 4
INDONESIA: NW. IRIAN JAYA
140
6.9 25
ALASKA: KODIAK ISLAND
57.09
8.3
VENEZUELA: MACUTO
-66
8.4

9. The Mohorovičić discontinuity  commonly known as the Moho, is the boundary  between the Earth crusts and the mantle. Named after the pioneering Seismologist Andrija Mohorovicic 
The Moho separates both the  oceanic crust  and continental crust  from underlying mantle. The Moho lies almost entirely within the  lithosphere , only beneath mid-ocean ridges does it define the lithosphere–asthenosphereboundary. The Mohorovičić discontinuity was first identified in 1909 by Mohorovičić, when he observed thatseismograms from shallow-focus earthquakes had two sets of P-waves and S-waves, one that followed a direct path near the Earth's surface and the other refracted by a high-velocity medium.[2]
The Mohorovičić discontinuity is 5 to 10 kilometres (3–6 mi) below the ocean floor, and 20 to 90 kilometres (10–60 mi), with an average of 35 kilometres (22 mi), beneath typical continents.[3]

11. ANDRIJA MOHOROVIČIĆ BIOGRAPHY
Andrija Mohorovičić was born in Volosko near Opatija in Croatia, on January 23, His father, Andrija came from Rukavac in Istria. He was a blacksmith who made anchors. His mother, Marija nee Poščić was born in Opatija. She died soon after Andrija’s birth.
            

12. ANDRIJA MOHOROVIČIĆ…….
Mohorovičić taught at the Nautical School in Bakar until At his own request he was then transferred to the science grammar school in Zagreb, where he became the director of the Meteorological Observatory on January 1, 1892.

13. ANDRIJA MOHOROVIČIĆ………
There he continued his research in meteorology, but after the turn of the century he focused his scientific activity on seismology which soon became his chief concern. He is today internationally recognized to be one of the great men of seismology and fundamental science from the first half of the 20th century.

14. ANDRIJA MOHOROVIČIĆ………
In 1893, having defended his dissertation "On the Observation of Clouds, and the Daily and Annual Cloud Period in Bakar", he was awarded the doctorate of philosophy at the University of Zagreb.
Soon afterwards he wrote the qualifying thesis for the position of privat-docent (unsalaried university lecturer), and in 1910 became titular associate professor.
From 1893 Mohorovičić taught courses in geophysics and astronomy at the Faculty of Philosophy in Zagreb.

15. ANDRIJA MOHOROVIČIĆ………
From the academic year 1899/1900, according to the preserved documentation, he also held courses in meteorology and climatology at the Faculty of Forestry.
As early as 1893 he had become an associate member, and in 1898 a full member of the Yugoslav Academy of Sciences and Arts in Zagreb (today HAZU).
In 1922 Andrija Mohorovičić retired. He died in Zagreb on December 18, 1936.

16. 1909 Discovery

18. Exploration
During the late 1950s and early 1960s the executive committee of the U.S. National Science Foundation funded drilling a hole through the ocean floor to reach this boundary. However the operation, named Project Mohole, never received sufficient support and was mismanaged[citation needed]; the United States Congress canceled it in Soviet scientists at the Kola Institute pursued the goal simultaneously; after 15 years they reached a depth of 12,260 metres (40,220 ft), the world's deepest hole, before abandoning their attempt in 1989.[7]
Reaching the discontinuity remains an important scientific objective. A more recent[when?] proposal considers a rock-meltingradionuclide-powered capsule with a heavy tungsten needle that can propel itself down to the Moho discontinuity and explore Earth's interior near it and in the upper mantle.[8] The Japanese project Chikyu Hakken ("Earth Discovery") also aims to explore this general area with the drilling ship, Chikyū, built for the Integrated Ocean Drilling Program (IODP).

23. Important Depth Zones 7 -10 km 30-33 km
In agreement with Mohorovicic’s discontinuity theory
Rigorous movement at plate boundaries / ends
“Split End of Plates”
Need of a Research Group
Welcome to “Seismicity Research Group”
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