EESA06H3 Lecture 3: Lecture 3
Document Summary
Lecture 3: lighthouse of the mediterranean = stromboli volcano (italy). In nobi earthquake japan 1891, earthquakes were produced by faults which means the earth surface is dynamic (constant change) and mobile. A fault scrap produced by an earthquake: fault scrap break in scope, fault trace along trace is where there is movement between rocks. Measuring the size of earthquakes: ritcher scale: logarithmic scale based on amplitude of deflection on a seismogram, moment magnitude: based on actual energy released where a m5 produces 32x more than a m4. High de(cid:374)sity (cid:396)o(cid:272)k, they(cid:859)(cid:396)e goi(cid:374)g to go fast: primary, they(cid:859)(cid:396)e the fastest. T(cid:396)a(cid:448)el up to 7 k(cid:373)/se(cid:272)o(cid:374)d: rocks extend then contract. Can go through solids and fluids: get refra(cid:272)ted th(cid:396)ough the (cid:272)o(cid:396)e, (cid:271)ut the(cid:396)e is a(cid:374) a(cid:396)ea (cid:449)he(cid:396)e they do(cid:374)(cid:859)t o(cid:272)(cid:272)u(cid:396) p-wave shadow zones, secondary, travel less fast. Up to 5 km/second: rocks wave goes through rocks, p(cid:396)i(cid:373)a(cid:396)y (cid:449)a(cid:448)es a(cid:396)(cid:396)i(cid:448)e fi(cid:396)st a(cid:374)d the(cid:374) se(cid:272)o(cid:374)da(cid:396)y (cid:449)a(cid:448)es (cid:271)e(cid:272)ause they(cid:859)(cid:448)e diffe(cid:396)e(cid:374)t (cid:448)elo(cid:272)ities.
