Earthquake - PowerPoint PPT Presentation

View by Category
About This Presentation
Title:

Earthquake

Description:

1st modern day seismograph in 1875 by Cecchi in Italy used a suspended pendulum ... Richter scale: measures movement of suspended pen (seismograph) during a quake ... – PowerPoint PPT presentation

Number of Views:180
Avg rating:3.0/5.0
Slides: 12
Provided by: Scien95
Learn more at: http://www.sciencea2z.com
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Earthquake


1
Earthquake
  • By Candy Olson

2
  • Fault lines relief of stress
  • Subduction
  • normal faulting
  • reverse faulting
  • strikeslip
  • transform
  • http//www.iris.edu/gifs/animations/faults.htm

3
tsunami
  • http/www.pbs.org/wnet/savageearth/animations/tsun
    ami/main.html
  • Danger
  • -Getting knocked about by debris
  • -Being pulled out to sea

4
Observed phenomena
  • Gas clouds-can be irritating, fatal, eclipse the
    sky
  • Lightning
  • Haze before, during and after a quake
  • Water/steam geiser
  • Sand, coal or other mineral geiser
  • Land splits, drops, or raises

5
seismograph
  • Measurements
  • 1st in China_at_135 C.E.
  • Han dynasty-invented by Chang Heng

6
  • 1st modern day seismograph in 1875 by Cecchi in
    Italy used a suspended pendulum
  • Work was done in 1880s in Japan that continued
    to improve on Cecchis work
  • http//earthquake.usgs.gov/learning/kids/kidsLearn
    ingLinks.php

7
Types of measurement
  • Richter scale measures movement of suspended
    pen (seismograph) during a quake
  • Seismic moment measures how much and how far
    the Earths crust moves during a quake

8
Types of earthquakes
  • Benioff zone- focus is deep in subduction zone
  • Surface- focus is at or near the surface of the
    Earths crust
  • http//www.pbs.org/wnet/savageearth/animations/ear
    thquakes/index.html

9
How do scientists know where the focus is?
  • One station recording a quake gives a circle of
    possibilites.
  • Two stations give two possibilities.
  • Three stations finds the location of the
    epicenter.
  • Four stations finds the depth/ focus.

10
Scientific advancement from studying earthquakes
  • Have learned that entire plates can shake in a
    great quake
  • Are learning what the interior of the Earth is
    made of/how its arranged.
  • Are learning the geological history of the
    Earth.

11
Lab activity
  • http//web.ics.purdue.edu/braile/edumod/slinky/sl
    inky.htm
About PowerShow.com