This is an earthquake. The focus is the place inside Earth’s crust where an earthquake originates. The point on the Earth’s surface
directly above the
focus is the epicenter. When energy is released at the focus, seismic waves travel outward from that point in all directions.
What is the differences and similarities of epicenter and focus?
What is the difference between the focus and epicenter of an earthquake?
The focus is the point within the earth where seismic waves originate
; it is centered on the part of the fault that has the greatest movement. The epicenter is on the earth’s surface directly above the focus.
What is the difference between the epicenter and the focus of an earthquake quizlet?
Focus is the first point of movement along a fault where all earthquake waves originate – it is below the surface. The epicenter is the point on the surface above the focus – the place on the surface that would receive the most intense vibrations.
What is the difference between focus and Hypocentre?
As nouns the difference between focus and hypocentre
is that focus is (countable|optics) a point at which reflected or refracted rays of light converge while hypocentre is (geology)
the focus of an earthquake
, directly under the epicentre.
Where is the epicenter of an earthquake group of answer choices?
The epicenter is the
point on the earth’s surface vertically above the hypocenter (or focus)
, point in the crust where a seismic rupture begins.
What is the relationship between an epicenter and the focus of an earthquake?
The hypocenter is the point within the earth where an earthquake rupture starts. The epicenter is
the point directly above it at the surface of the Earth
. Also commonly termed the focus.
How do you determine the epicenter?
Measure the difference in arrival times between the first shear (s) wave and the first compressional (p) wave, which can be interpreted from the seismogram.
Multiply the difference by 8.4
to estimate the distance, in kilometers, from the seismograph station to the epicenter.
What is seismology used for?
1 Concept. Seismology is
the science of earthquakes to study the causes and effects of minute pulsation to most catastrophic natural phenomenon inside the earth
. The method can be classified broadly into two major divisions depending on the energy source of the seismic waves.
At what depth is the focus?
Shallow earthquakes are between
0 and 70 km deep
; intermediate earthquakes, 70 – 300 km deep; and deep earthquakes, 300 – 700 km deep. In general, the term “deep-focus earthquakes” is applied to earthquakes deeper than 70 km.
Where do earthquakes show the most damage?
The
epicenter
is the point on the land surface that is directly above the focus. In about 75% of earthquakes, the focus is in the top 10 to 15 kilometers (6 to 9 miles) of the crust. Shallow earthquakes cause the most damage because the focus is near where people live.
Why do shallow focus earthquakes cause more damage?
Shallow quakes generally tend to be
more damaging than deeper quakes
. Seismic waves from deep quakes have to travel farther to the surface, losing energy along the way.
What US state has the most earthquakes?
California
has more earthquakes that cause damage than any other state. Alaska and California have the most earthquakes (not human-induced).
What are the most destructive waves?
Of the two types of surface waves,
the L-waves
are the most destructive. They can literally move the ground beneath a building faster than the building itself can respond, effectively shearing the base off of the rest of the building.
Which point in Figure 1 is the epicenter of the earthquake?
| Recording Station Calculated Distance (miles)? | Salt Lake City : miles |
|---|
What are the 10 causes of earthquake?
- Groundwater extraction – decrease in pore pressure.
- Groundwater – increase in pore pressure.
- Heavy rain.
- Pore fluid flow.
- High CO2 pressure.
- Building dams.
- Earthquakes.
- No earthquakes (Seismic quiescence)
Why is it important to know where the epicenter is?
The main importance in determining the epicentre is
so that the fault that ruptured causing the earthquake can be identified
. … If the fault is previously unknown (such as the 2010 Canterbury earthquake), then it is important because it means that the hazard models for the area need improvement.
