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# Focal depth of earthquakes along a subduction zone

Mon 20 Jun, 2016 03:47 am
What is the approximate direction of subduction at 20 S 70 W?
What is the approximate angle of subduction along 20 S?
http://i.imgur.com/iEzOa.gif
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Type: Question • Score: 1 • Views: 1,710 • Replies: 3
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farmerman

2
Mon 20 Jun, 2016 08:59 am
@aidinxo,
1. get a topo map sheet from USGS sheets and a scale for the map and locate and draw the roughly parallel lines joining the shallowest isohypos of the same depth zones. Then draw a line perpendicular to two lines and compute the approximate drop per mile (or km). (Make sure you have the correct data planes for these depths
Remember that 1 degree is 92 ft per mile. Do the math, its really easy, my way

2as far as direction, cmon, are you a serious geology student or just taking "rocks for Jocks"
farmerman

1
Mon 20 Jun, 2016 10:30 am
@farmerman,
I was reffering to "Hypocenters" of earthquakes. Cascadia has a fairly uniform subduction plane that you can measure from these isohypos.
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aidinxo

1
Mon 20 Jun, 2016 12:05 pm
@farmerman,
Thank you Farmerman!
I just took this course and this is 3rd chapter's exam.
I didnt have any geology background.
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