April 18 1906 California’s San Andreas Fault snacks shaking San Francisco for
Fault snacks shaking San Francisco for
Fault snacks shaking San Francisco for nearly 60 terrifying seconds when the
nearly 60 terrifying seconds when the
nearly 60 terrifying seconds when the trembling stops the disaster is only
trembling stops the disaster is only
trembling stops the disaster is only beginning gas lines rupture setting off
beginning gas lines rupture setting off
beginning gas lines rupture setting off massive fires some 700 people died most
massive fires some 700 people died most
massive fires some 700 people died most of City 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 it must release
on the Richter scale it must release
on the Richter scale it must release about 30 times as much energy as the
about 30 times as much energy as the
about 30 times as much energy as the number below it
number below it
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 sea floor there’s no
opened up on the sea floor there’s no
opened up on the sea floor there’s no stopping the surface of the earth from
stopping the surface of the earth from
stopping the surface of the earth from changing and moving so engineers are
changing and moving so engineers are
changing and moving so engineers are focusing on ways to create better
focusing on ways to create better
focusing on ways to create better buildings highways and bridges and
buildings highways and bridges and
buildings highways and bridges and structures that will remain safe and
structures that will remain safe and
structures that will remain safe and stay in one piece
stay in one piece
stay in one piece next time the earth begins to shape
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