Time Math



HW #5Due before class starts on Tuesday, October 22, 2014. Name: _____________________________________________________Period: ________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.Important Reminders:There is a TEST this FridayMr. LaFranca's Website - . Petreshock’s s Website - for the week:Earthquakes, Epicenter, P and S wavesUse the words in the box to fill in the blanks. Back and forth Circles Cross Damage Difference Distance Earthquake Energy Epicenter Fire Focus Linear Liquids Magnitude P – wave Pacific People Richter Seismic Seismograph S-wave Tectonic ThreeLithosphere FastestEarthquakes 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 MathSubtract the following times. Write your answers with hours, minutes and seconds (hh:mm:ss).1.10:09:50-10:08:252. 9:45:10-9:25:103.3:15:33-3:14:434.7:22:55-7:21:555.4:15:57- 4:14:306.1:24:43- 1:22:057.2:05:17- 1:55:348.8:17:05- 7:30:059.6:57:32- 5:58:3310.8:17:28-7:45:3611. 12:59:59-11:04:2112.5:02:03- 4:59:5913.04:28:53-03:52:41 14.07:49:36- 04:03:51 15.09:15:24- 02:16:2516.11:25:14-01:02:19Finding 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.seismograph stationArrival (clock time)Difference in arrival time min. & sec.Distance to epicenter (km)"P" Wave"S" WaveA5:33:405:36:40B5:40:255:48:45C5:37:305:43:30110:23:3510:30:35210:23:2010:30:00310:18:1510:20:55According 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?1524005016576200114300Regents Questions ................
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