April 18 1906 California San Andreas Fault
Fault
Fault snaps shaking San Francisco for nearly
snaps shaking San Francisco for nearly
snaps shaking San Francisco for nearly 60 terrifying seconds when the trembling
60 terrifying seconds when the trembling
60 terrifying seconds when the trembling stops the disaster is only beginning gas
stops the disaster is only beginning gas
stops the disaster is only beginning gas lines rupture setting off massive fires
lines rupture setting off massive fires
lines rupture setting off massive fires some seven hundred people died most of
some seven hundred people died most of
some seven hundred people died most of city is reduced to ruins
this trembling of the ground caused when
this trembling of the ground caused when masses of rock suddenly shift below the
masses of rock suddenly shift below the
masses of rock suddenly shift below the earth’s surface is called an earthquake
earth’s surface is called an earthquake
earth’s surface is called an earthquake hundreds of little earthquakes shake the
hundreds of little earthquakes shake the
hundreds of little earthquakes shake the planet every day but most pass unnoticed
planet every day but most pass unnoticed
planet every day but most pass unnoticed they usually occur along the boundaries
they usually occur along the boundaries
they usually occur along the boundaries of the thin plates that cover the earth
of the thin plates that cover the earth
of the thin plates that cover the earth like an eggshell driven by the heat deep
like an eggshell driven by the heat deep
like an eggshell driven by the heat deep within the Earth’s core the plates grind
within the Earth’s core the plates grind
within the Earth’s core the plates grind against each other along lines called
against each other along lines called
against each other along lines called faults when the plates motion is blocked
faults when the plates motion is blocked
faults when the plates motion is blocked stress builds up finally the fault gives
stress builds up finally the fault gives
stress builds up finally the fault gives way the released energy races through
way the released energy races through
way the released energy races through the earth in the form of seismic waves
the earth in the form of seismic waves
the earth in the form of seismic waves scientists record these waves on a
scientists record these waves on a
scientists record these waves on a device called a seismograph these zigzag
device called a seismograph these zigzag
device called a seismograph these zigzag lines show the strength of various
lines show the strength of various
lines show the strength of various seismic waves using the line scientists
seismic waves using the line scientists
seismic waves using the line scientists grade earthquakes on the Richter scale
grade earthquakes on the Richter scale
grade earthquakes on the Richter scale for a quick to measure one number higher
for a quick to measure one number higher
for a quick to measure one number higher on the Richter scale
on the Richter scale
on the Richter scale it must release about 30 times as much
it must release about 30 times as much
it must release about 30 times as much energy as the number below it
energy as the number below it
energy as the number below it every year about a hundred thousand
every year about a hundred thousand
every year about a hundred thousand earthquakes Rumble through the ground
earthquakes Rumble through the ground
earthquakes Rumble through the ground hard enough for people to feel them of
hard enough for people to feel them of
hard enough for people to feel them of these only about a thousand are strong
these only about a thousand are strong
these only about a thousand are strong enough to damage property but a powerful
enough to damage property but a powerful
enough to damage property but a powerful earthquake can be devastating on average
earthquake can be devastating on average
earthquake can be devastating on average about 10,000 people die each year as a
about 10,000 people die each year as a
about 10,000 people die each year as a result of earthquakes
the greatest recorded earthquake ever to
the greatest recorded earthquake ever to hit North America measured a massive 9.2
hit North America measured a massive 9.2
hit North America measured a massive 9.2 the tremor struck Alaska
the tremor struck Alaska
the tremor struck Alaska on March 28 1964 a camera on board a
on March 28 1964 a camera on board a
on March 28 1964 a camera on board a ship docked in Valdez recorded the
ship docked in Valdez recorded the
ship docked in Valdez recorded the draining of the entire harbor as a chasm
draining of the entire harbor as a chasm
draining of the entire harbor as a chasm opened up on the seafloor
opened up on the seafloor
opened up on the seafloor there’s no stopping the surface of the
there’s no stopping the surface of the
there’s no stopping the surface of the earth from changing and moving so
earth from changing and moving so
earth from changing and moving so engineers are focusing on ways to create
engineers are focusing on ways to create
engineers are focusing on ways to create better buildings highways and bridges
better buildings highways and bridges
better buildings highways and bridges and structures that will remain safe and
and structures that will remain safe and
and structures that will remain safe and stay in one piece the next time the
stay in one piece the next time the
stay in one piece the next time the earth begins to shape
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