29 Questions
What is the term used to describe divergent boundaries in continental regions?
Rift zones
At what depths do earthquakes typically occur in rift zones?
2-8 km
What is the result of the Earth's unchanging size?
Crust is destroyed at about the same rate as it is created
What occurs when an oceanic plate converges with a continental plate?
The oceanic plate subducts under the continental plate
What is a common feature of oceanic-continental convergence?
The rapid uplift of mountain ranges
What happens when two oceanic plates converge?
The older plate is subducted under the younger plate
What was the magnitude of the strongest recorded earthquake in the world?
9.5
How many people died in the Indian Ocean Tsunami of 2004?
At least 225,000
What is the primary cause of life and economic loss during earthquakes?
Inferior built environment
When did the Moro Gulf earthquake occur?
17 August 1976
What is the estimated range of economic impacts of earthquakes?
$100 million to $100 billion
Can earthquakes be accurately predicted?
No, earthquakes cannot be predicted
In what year was the Modified Mercalli Intensity scale developed?
1931
What is the name of the instrument developed by J.Milne, J.Ewing, and T.Gray?
Milne seismograph
What feature did Emil Weichert introduce in 1898 to improve seismograph accuracy?
Viscous damping mechanism
Who developed one of the first devices that records relative motion between a pendulum and the shaking ground?
Filippo Cecchi
What is the name of the Russian seismologist who introduced a design that did away with the need for a mechanical linkage?
Boris Galitzin
What is the oldest known record produced by Cecchi's instrument dated?
February 23, 1887
What is the primary purpose of collecting intensity data in a region?
To develop a seismic risk map of a region or country
What are the three features of shaking that intensity scales are based on?
Perception by people, performance of buildings, and changes to natural surroundings
What is the name of the intensity scale developed by Giuseppe Mercalli in 1902?
Modified Mercalli Intensity Scale (MMI)
What factor does not affect the intensity of an earthquake?
Frequency of the seismic waves
Who developed the Rossi-Forel Intensity Scale?
Michele Stefano Conte de Rossi and FrançoisAlphonse Forel
How many intensity scales have been developed to evaluate the intensity of earthquakes?
At least 5
What is the magnitude of an earthquake based on?
The maximum amplitudes of body or surface seismic waves
In which country were the first attempts to define magnitude scales made?
Japan and California
How many seismic stations are there in the Philippines?
65
What is the symbol for the Richter magnitude scale?
ML
What is the location of the central operating station in the Philippines?
Diliman, Quezon City
Test your knowledge about some of the deadliest earthquakes and tsunamis in history, including the Indian Ocean Tsunami of 2004 and the Moro Gulf earthquake of 1976. Learn about the devastating impact of these natural disasters on various countries and communities.
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