Gaelic Wolf Consulting
URL: http://www.gaelwolf.com/pendulum.html         3/27/01

The Rattle In Seattle
Earthquake As Artist

 

We are presently experiencing an extraordinary number of requests for this web page as people from all over the world arrive to have a look at the earthquake rose. If the page is loading very slowly, or if images don't appear, it's because too many people are trying to look at the page right now. If that's the case, you may wish to click here to go to the ABC News article about the earthquake rose. Please don't hesitate to try our site again later, when things are a little quieter.

Please accept our humble apologies for any inconvenience caused by our server when things are not loading as quickly as they should. We're looking forward to your visits!

On February 28, 2001, a magnitude 6.8 earthquake, located some thirty miles below the surface of the earth and a few miles away from Olympia Washington, moved the ground for a bit more than half a minute.

The pendulumA sand tracing pendulum, located at a shop in Port Townsend called Mind Over Matter, produced some very interesting patterns. (Contact: 888-385-3853 or via e-mail at mom@olympus.net.)

Those of us who have done disaster relief work after major earthquakes don't often think of them as having an artistic bent, but the tracings the pendulum made during this quake demonstrate that they can be rather creative when they have an appropriate tool at hand!

Since originally sending a less fully designed page to a couple of seismologists and a geomorphologist on the evening of the event, these photos have really made the rounds! After hearing from people all over the world, we've decided to provide a bit more information for those of you who are interested.

Mind Over Matter has a source for the pendulums, should you wish to purchase one. Please feel free to contact them, using the above information, for more information. .

Here are some of the photos taken shortly after the ground stopped moving:

The smooth curves you see to the outside of the "earthquake rose" are what you normally see when the pendulum moves according to the laws of Newtonian physics...and without seismic assistance. You can see the patterns left when someone started the pendulum on two separate occasions before the earthquake.

The earthquake's handiwork is the design in the center.

According to one of the geophysicists we sent the photos to, "The images are quite esthetically pleasing. I had not thought about the possibility of creating art in this way."

"The sand preserves two features of the earthquake waves quite nicely. The "flower" in the center records the surface movements associated with the higher frequency waves that arrived first. The outer larger amplitude oscillations record the lower frequency waves that arrived later. I suspect that the axis of these oscillations was almost north-south (ie directed towards the epicenter)."

Of course, once everything started to slow down after the shaking stopped, the pendulum slowed to a stop, gradually "overwriting" the pattern in tighter circles as it moved back to its natural center. If you look at it closely, you'll note that the pendulum was apparently centering in one spot, and then moved a final time to come to rest in a slightly different location. As a result, we're thinking that there may have been a bit of last minute settling in the ground, and there will be an engineer coming to check the building for signs of problems.

The following two images are close-ups of the design made by the quake. The second is contrast enhanced to help you see more detail.


We've had several positive comments from all over the globe about this unique peek at the effects of an earthquake. We were fortunate to come through this one with as little damage and injury as we did, and we hope you share our sense of awe at what beauty can come from even the destructive forces of nature. Our hearts go out to those whose experience with earthquakes has been far more painful than what we went through with this one.

 

spacerNorman MacLeod
spacerPort Townsend, Washington