Earthquake Wave Modeling Lab (Ver 3.11)

Vernier Software is HERE and HELP setting that up is, well, back there

We'll be working on an earthquake modeling lab this week.

GOAL:

The purpose of this lab is to see how well we can model ground motion and associated damage to structures in Gig Harbor during a full rip of the CSZ (9.0 M) OR a 7.1 M Tacoma Fault earthquake using classroom tools.

PRE-LAB:

In order to 'successfully' model a 9.0 CSZ event, you have to know what to expect in GH during such an earthquake.

0) I will assemble you into groups of 3 or 4 based on your sitting arrangements (fully masked and socially distanced if you please! Please elect, appoint, volunteer a Project Manager -- the PM's goal is to keep things moving along. The PM's goal SHOULD NOT BE TO DO ALL (or even most) of the work.

1) Work with your group (fully masked and socially distanced if you please! or family members/folks at home if you are remote) to form a well grounded (pardon the pun!) understanding of ground motion at various places around Western Washington, and especially in Gig Harbor

Do that by finding/researching information on ground motion (MMI) and Peak Ground Acceleration estimates. That research is absolutely, positively critical for this lab! There are lots of pretty graphs and charts online to help with this.... You just need to find 'em and use 'em appropriately.

Suggested sources:

  • Reading 1: Cascadia Subduction Zone Earthquakes: A magnitude 9.0 Scenario (I'm *pretty* sure that this article was the basis for our reading "The Really Big One" that we did in class before Spring Break)
  • Tacoma Fault 7.1 Scenario is HERE
  • Or (of course) our favorite online portal

2) Work with your group (fully masked and socially distanced if you please! or family members/folks at home if you are remote) to determine whether your group will analyze ground motion in GH based on a FULL RIP CSZ Event or a 7.1 EQ on the Tacoma Fault.

3) Elect, appoint, volunteer each member of the group tasks (data collector/observer, shake table operator, accelerometer monitor etc...)

Students @ GHHS, please acquaint yourself with the wireless accelerometers and graphing/recording software. Download the Vernier accelerometer software HERE. Students working remotely, please we have multiple options... I can provide each group with materials

4) Please work with your group (fully masked and socially distanced if you please! or family members/folks at home if you are remote) to review the Lab Report specifications:

LAB REPORT:

  • PURPOSE:

    How accurately can we model the effects in Gig Harbor of a 9.0 CSZ or 7.1 Tacoma Fault earthquake event using a classroom shake-table.

    The purpose of this lab is NOT to try and make a model for a large quake in our area. The goal is to see HOW WELL you can accurately model the effects of such a quake on Gig Harbor. Some model objects should fail, some should survive and some should be somewhere in between.

  • METHODS: Be sure to show revisions in your METHODS section. It will take multiple tries to get things to behave Please keep in mind your model may not be entirely successful. That is ok.
  • DATA TABLE Please show the following:
    • The ground acceleration you were trying to replicate
    • How successful you were in doing that
    • Visual observations of each type of model describing the motion and results (if any) of that motion
    • An indication of whether that motion accurately modeled that object in the real world
  • DISCUSSION:
    • Be sure and refer back to the purpose of this lab

LAB DAY(S)

We will MOST definitely adhere to all guidelines and recommendations regarding wearing masks and social distancing.

We can (and will!) still collaborate, we'll just make sure to stay appropriately distanced!

1) Build a shake table using rubber bands, cardboard and bouncy balls... you can bring extra materials from home if you wish

2) Work with your group (fully masked and socially distanced if you please! or family members/folks at home if you are remote) to design and build structures attached to your shake table that accurately mimic structures in Gig Harbor during either a FULL RIP CSZ or a 7.1 M Tacoma Fault EQ. Some of those will fail and some will not.

NOTE: Students often work to create structures that will withstand a CSZ or Tacoma Fault event... that is not the goal here.

Please build fairly basic models for:

1) Hospitals

2) Buildings that perform well

2b) Buildings that fail

3) Water/sewage pipes

4) Electrical transmission lines

5) Roads

6) Bridges.

You should ATTEMPT to make each type of model perform the same way as its real life counterpart will perform during the EQ event you are modeling