This month, NOS's National Geodetic Survey is conducting a study on the National Mall to help the National Park Service understand the settling and shifting of the ground underneath the monuments on the National Mall, particularly after the August 2011 earthquake. Tune in to our interview with Dave Doyle, NGS Chief Geodetic Surveyor, to learn more. (13 minutes)

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National Geodetic Survey

National Mall — National Park Service

Global Positioning

Height Modernization

Building a Better Geoid (podcast)

Height Modernization (podcast)

In 2007, hundreds of birds were found stranded or dead in California's Monterey Bay, coated with an unknown yellow-green substance that was eating away at the protective covering on their feathers. In this episode, we revisit a 2009 interview with a researcher from the University of California at Santa Cruz to learn how and why this happened.

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National Centers for Coastal Ocean Science

Monitoring and Event Response of Harmful Algal Blooms

Integrated Ocean Observing System

California Program for Regional Enhanced Monitoring for PhycoToxins

Central and Northern California Ocean Observing SystemCalifornia

Department of Fish and Game

University of Calfornia at Santa Cruz, Ocean Sciences Department

Monterey Bay Aquarium Research Institute

Moss Landing Marine Laboratories

Curious about the basics of harmful algal blooms? Learn what you need to know in less than three minutes on today's Diving Deeper Shorts.

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Diving Deeper Podcast: Harmful Algal Blooms (10.07.09)