The document discusses various topics related to earthquakes including:
1) What causes earthquakes, the elastic rebound theory of faulting, and the focus and epicenter of quakes.
2) Where most earthquakes occur, types of seismic waves, and how an epicenter is located using timing of wave arrivals.
3) How the size and strength of quakes are measured using intensity scales and magnitude, and some of the destructive effects of earthquakes.
4) Attempts to predict quakes through monitoring precursors and gaps along faults, though prediction remains challenging. Control of quakes by inducing small quakes is also discussed.
geophysics seismic waves ,its types, particle motion in S P ans surface waves. Travel time graph . critically refracted , direct and reflected wave arrivals. what is critical distance and crossover distance. relation between critical refracted ,direct and reflected waves.Elastic constants like bulk modulus shear , young's modulus and poisson's ratio. Lame's constant.
geophysics seismic waves ,its types, particle motion in S P ans surface waves. Travel time graph . critically refracted , direct and reflected wave arrivals. what is critical distance and crossover distance. relation between critical refracted ,direct and reflected waves.Elastic constants like bulk modulus shear , young's modulus and poisson's ratio. Lame's constant.
What is earthquakes? What is the Elastic Rebound Theory?
Seismographs record earthquake events. Where Do Earthquakes Occur and How Often? What are the Destructive Effects of Earthquakes? How are the Size and Strength of an Earthquake Measured? Can Earthquakes be Predicted? Can Earthquakes be Controlled?
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https://alandix.com/academic/papers/synergy2024-epistemic/
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https://arxiv.org/abs/2306.08302
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Major cyber events in 2024
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Length: 30 minutes
Session Overview
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During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
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I have heard many times that architecture is not important for the front-end. Also, many times I have seen how developers implement features on the front-end just following the standard rules for a framework and think that this is enough to successfully launch the project, and then the project fails. How to prevent this and what approach to choose? I have launched dozens of complex projects and during the talk we will analyze which approaches have worked for me and which have not.
1. What are Earthquakes?
• The shaking or trembling caused by the sudden
release of energy
• Usually associated with faulting or breaking of rocks
• Continuing adjustment of position results in
aftershocks
2. What is the Elastic Rebound Theory?
• Explains how energy is
stored in rocks
– Rocks bend until the
strength of the rock
is exceeded
– Rupture occurs and
the rocks quickly
rebound to an
undeformed shape
– Energy is released in
waves that radiate
outward from the
fault
3. The Focus and Epicenter of an Earthquake
• The point within Earth
where faulting begins is
the focus, or hypocenter
• The point directly above
the focus on the surface
is the epicenter
4. Seismographs record
earthquake events
At convergent boundaries,
focal depth increases
along a dipping seismic
zone called a Benioff
zone
5. Where Do Earthquakes Occur and How Often?
~80% of all earthquakes occur in the circum-Pacific belt
– most of these result from convergent margin activity
– ~15% occur in the Mediterranean-Asiatic belt
– remaining 5% occur in the interiors of plates and on
spreading ridge centers
– more than 150,000 quakes strong enough to be felt are
recorded each year
6. The Economics and Societal Impacts of EQs
Damage in Oakland, CA,
• Building collapse 1989
• Fire
• Tsunami
• Ground failure
7. What are Seismic Waves?
• Response of material to the
arrival of energy fronts released
by rupture
• Two types:
– Body waves
• P and S
– Surface waves
• R and L
8. Body Waves: P and S waves
• Body waves
– P or primary waves
• fastest waves
• travel through solids,
liquids, or gases
• compressional wave,
material movement is
in the same direction
as wave movement
– S or secondary waves
• slower than P waves
• travel through solids
only
• shear waves - move
material
perpendicular to
wave movement
9. Surface Waves: R and L waves
• Surface Waves
– Travel just below or along the ground’s surface
– Slower than body waves; rolling and side-to-side
movement
– Especially damaging to buildings
10. How is an Earthquake’s Epicenter Located?
Seismic wave behavior
– P waves arrive first, then S waves, then L and R
– Average speeds for all these waves is known
– After an earthquake, the difference in arrival times at a
seismograph station can be used to calculate the distance
from the seismograph to the epicenter.
11. How is an Earthquake’s Epicenter Located?
Time-distance graph
showing the average
travel times for P- and S-
waves. The farther away a
seismograph is from the
focus of an earthquake,
the longer the interval
between the arrivals of
the P- and S- waves
12. How is an Earthquake’s
Epicenter Located?
• Three seismograph stations
are needed to locate the
epicenter of an earthquake
• A circle where the radius
equals the distance to the
epicenter is drawn
• The intersection of the
circles locates the epicenter
13. How are the Size and Strength of an Earthquake Measured?
• Intensity
– subjective measure
of the kind of
damage done and
people’s reactions
to it
– isoseismal lines
identify areas of
equal intensity
• Modified Mercalli Intensity Map
– 1994 Northridge, CA earthquake,
magnitude 6.7
14. How are the Size and Strength of an Earthquake Measured?
• Magnitude
– Richter scale
measures total amount
of energy released by
an earthquake;
independent of
intensity
– Amplitude of the
largest wave produced
by an event is
corrected for distance
and assigned a value
on an open-ended
logarithmic scale
15. What are the Destructive Effects of Earthquakes?
• Ground Shaking
– amplitude, duration, and damage increases in poorly
consolidated rocks
16. Can Earthquakes be Predicted?
Earthquake Precursors
– changes in elevation or tilting of land surface,
fluctuations in groundwater levels, magnetic field,
electrical resistance of the ground
– seismic dilatancy model
– seismic gaps
17. Can Earthquakes be Predicted?
Earthquake Prediction Programs
– include laboratory and field studies of rocks before, during,
and after earthquakes
– monitor activity along major faults
– produce risk assessments
18. Can Earthquakes be Controlled?
• Graph showing the
relationship between the
amount of waste injected
into wells per month and
the average number of
Denver earthquakes per
month
• Some have suggested
that pumping fluids into
seismic gaps will cause
small earthquakes while
preventing large ones