This art installation, known as the Parkfield Interventional EQ Fieldwork (PIEQF), uses earthquake waves recorded by the USGS seismic network in California to trigger a hydraulic shake table installed in an excavated trench. The shake table is activated in near real-time as earthquakes occur throughout California. The shaking causes 10-foot steel vertical rods attached to the table to oscillate and resonate, reflecting the dynamic nature of the Californian landscape.
The shake table was located in the small town of Parkfield, California, between the Parkfield Cafe and Fire Station. It was installed and open to the public through November, 2008. Parkfield is situated right on the San Andreas Fault midway between San Francisco and Los Angeles. Parkfield is sometimes referred to as the “earthquake capital of California”, due to the large number of M6.0 – M6.5 earthquakes that have occurred over the past 150 years. The most recent Parkfield earthquake, a M6.0, occurred in 2004.
This shake table exhibit seeks to promote earthquake awareness and preparedness for Californians by merging earthquake science and art in an innovative, interactive display. It is a collaboration between U.S. Geological Survey seismologist Andy Michael and Australian artist, D.V. Rogers. The Parkfield installation embodies the extra dimension art brings to science, helping to visualize what’s going on below the surface in a way science can’t on its own.
The conceptual basis behind the earthwork is to bring all seismic events to a hypothetical epicentre. Each time a seismic event is reported, the horizontal motion of an earthquake is triggered on the shake table, providing a feedback loop between California quakes and a physical and mechanical representation of the events. According to David, “PIEQF is a seismic art work designed to introduce human interaction within geological time. Conceptually PIEQF is a blip on the geological radar, an interactive earthwork which connects, maps and creates a temporary reference point within the scale of geological time.”
Surrounding the earthquake shake table and buried within the excavation is an array of vertical motion sensors called L10 Geophones. These Geophones are excited when walked over or jumped upon which trigger the vertical motion of the shake table. Visitors to PIEQF can engage interactively with the earthwork.
PIEQF sleeps at night between 9.30pm and 6.30am. The control system keeps polling seismic events overnight, then replays them at 6.30am every morning. After this morning replay sequence, PIEQF switches into live mode and is triggered by near real-time reported earthquakes which are reported between 30sec - 3min after actual earthquakes occur.
Photos taken from a kite-lofted camera, showing the shake table and control bunker (left) and the earthwork in context of the small town of Parkfield, CA (right).
The Art-Science of Earthquakes
Lecture by D.V. Rogers
November 23, 2009 (video)
The exhibit was a geologically interactive, seismic machine earthwork temporarily installed in Parkfield in 2008. Rogers presented the history, conceptual premise, documentation of the work, and also put forward the idea of how early 21st century cultural practice could be used to encourage earthquake awareness and preparedness.
Looking straight up from the center of the Shake Table (top) followed by two nighttime shots showing the hydraulic actuators that create vertical movement on the shake table.
All photos by Scott Haefner, USGS.