Earthquakes recorded along the b-b' line shown on the map in table: position of volcanoes along the b- question 2. b' line shown on the map in question 2 location east of depth of earthquake trench location east or west -20 km 0 km of trench 20 km -30 km 250 km e 50 km -60 km 300 km e 80 km -70 km 330 km e 120 km -80 km 350 km e 200 km -110 km 390 km e 250 km -120 km 410 km e 300 km -130 km 330 km -125 km 360 km -130 km 390 km -140 km 430 km -160 km 470 km -170 km 500 km -180 km 3. observing the distribution of earthquakes at depth. mapping the location of deep earthquakes geologists better understand the movement of tectonic plates be low earth's surface. to answer these questions, you will need the tables of earthquake and volcano locations found on blackboard. a creating a profile on the chart to the right, draw a horizontal line that indicates the earthquake and volcano locations along b-b' 600 trench 100 200 300 700 position of the surface of the earth. [surface 0 km depth.] -100 400 500 800 0 place an x on the chart that -50 indicates the location of the -100 trench at the surface of the earth -150 using the earthquake location and depth data found on blackboard, plot the positions of the earthquakes 200 -250 300 -350 using the volcano location data found on blackboard, draw a 400 b' small triangle for each volcano (note: depth zero). as you did in question 2, draw a line indicating the boundary between the two tectonic plates by using the earthquake positions as a guide. [note: draw a smooth line/curve, not a jagged line] lightly color/shade in the portion of the profile that represents the tectonic plate that is located to the west of the trench as shown on the map in question 2. what is the name of this tectonic plate? b. interpreting the data what type of plate tectonic boundary is shown in your profile? using a protractor (there is one at back of your lab manual), measure the angle downward between the horizontal surface (o km deep), the trench (x), and your plate boundary. at what angle (in degrees) does this boundary dip into the earth? as a tectonic plate dips into the earth, it begins to melt. this melted rock is called "magma", which rises towards the surface. the rising magma can break through the surface and a volcano is born! volcanoes are located on the surface directly above its magma source at depth. indicate the melting zone with your highlighter on the profile. oat what depth does melting begin to occur (in km)? what is the distance (along the surface) between the closest volcano and the trench? o depth of eathquake (km)