Acoustic detector mounted on a mast near the entrance of a lava tube
![Acoustic detector mounted on a mast near the entrance of a lava tube opening at El Malpais National Monument, New Mexico.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/AcousticDetectorElMalpaisNMErnestValdez2011%20-%20Copy.jpg?itok=JDJI6dS8)
Detailed Description
Acoustic detector mounted on a mast near the entrance of a lava tube opening at El Malpais National Monument, New Mexico.
Acoustic detector mounted on a mast near the entrance of a lava tube opening at El Malpais National Monument, New Mexico.