Due before class starts on Tuesday, October 22, 2014.

Name: _____________________________________________________Period: ________

Use the words in the box to fill in the blanks.

IMPORTANT REMINDERS: THERE IS A TEST THIS FRIDAY MR. LAFRANCA'S WEBSITE - HTTPS://SITES.GOOGLE.COM/SITE/MRLAFRANCAES/ MS. PETRESHOCK’S S WEBSITE - HTTPS://SITES.GOOGLE.COM/SITE/PETRESHOCK/

TOPICS FOR THE WEEK :

EARTHQUAKES, EPICENTER, P AND S WAVES

COOL ES FACTS OF THE WEEK! 1. The largest recorded earthquake was a 9.5 quake in Chile in 1960.

2. The deadliest known quake in history shook China in 1556, taking about 830,000 lives.

3 Each year, there are about a million earthquakes around the world. But only about 100 of these cause serious damage.

4. There is about 1 earthquake every 30 seconds.

5. You may not notice a magnitude 2 quake.

6.You would feel the ground shake in a magnitude 3 quake.

HW #5

Back and forth Circles Cross Damage Difference Distance Earthquake Energy Epicenter Fire

Earthquakes occur because of a sudden release of stored_________. This energy has built up over long periods of time as a result of _____________ forces within the earth. Most earthquakes take place along faults in the Earth’s _________ or crust. This sudden motion causes seismic waves that radiate from their point of origin called the ________ , which is deep in the ground. These waves travel through the earth. It is these ________ waves that can produce ground motion which people call an_________________. Each year there are thousands of earthquakes that can be felt by ______________ and over one million that are strong enough to be recorded by instruments. Strong seismic waves can cause great local ______________and they can travel large distances. But even weaker seismic waves can travel far and can be detected by sensitive scientific instruments called _________. The strength or _______________ of an earthquake can be calculated using the __________ scale.

Although seismologists recognize different types of waves, we are interested in only two types: P (primary) waves are the ______________ waves arrive first. The _________ is slower and arrives second. P- waves can travel though solids and ________ whereas S waves can only travel through solids. P-wave travel in a ______________ or same direction as the Earthquake, while S-waves move __________________.

Above the focus of an earthquake is the _____________. it is always located on the surface. In order to locate the epicenter of an Earthquake, you must calculate the ______________ between the P-wave and the S-wave arrival times at _______________ seismograph stations. Then you must find out the __________ to epicenter using your Earth Science Reference Table. You can find the precise location by drawing ___________ around three seismograph stations on a Map. Where the three circles line ____________ each other is the location of the Earthquake’s epicenter.

Like volcanoes, many of the Earth's earthquakes occur around the ___________ plate, which is also known as the Ring of ___________.

Time Math

Subtract the following times. Write your answers with hours, minutes and seconds (hh:mm:ss).1.

10:09:50-10:08:25

2. 9:45:10

-9:25:10

3.3:15:33

-3:14:43

4.7:22:55

-7:21:55

Back and forth Circles Cross Damage Difference Distance Earthquake Energy Epicenter Fire

5.4:15:57

- 4:14:30

6.1:24:43

- 1:22:05

7.2:05:17

- 1:55:34

8.8:17:05

- 7:30:05

9.6:57:32

- 5:58:33

10.8:17:28

-7:45:36

11. 12:59:59

-11:04:21

12.5:02:03

- 4:59:59

13.04:28:53

-03:52:41

14.07:49:36

- 04:03:51

15.09:15:24

- 02:16:25

16.11:25:14

-01:02:19

Finding Epicenters

Complete the chart below using your knowledge of Earth Science and your Earth Science Reference Tables (see next page). Please note that stations A, B, and C are picking up a different earthquake than stations 1, 2, and 3.

seismograp Arrival (clock time) Difference in Distance to

h station arrival time min. & sec.

epicenter

(km)

"P" Wave "S" Wave

A 5:33:40 5:36:40

B 5:40:25 5:48:45

C 5:37:30 5:43:30

1 10:23:35 10:30:35

2 10:23:20 10:30:00

3 10:18:15 10:20:55

According to your Handy Dandy Earth Science Reference Tables, what is the difference in arrival times of P-waves & S-waves at a seismic station 6,200km away from the epicenter of an earthquake?

If the earthquake occurs at 9:20 am, what time will a seismic station 2,600km away pick up the P-wave?

What time will it pick up the S-wave?

Regents Questions