ities greater than 10 million inhabitants) are multiplying, particularly in South America, Asia, and other parts of the developing world. By pumping pollutants into the atmosphere, these hubs of industrial activity and intensive motor-vehicle use cause local, regional, and global effects that are coming into focus as a result of targeted scientific investigations. In this press conference, panelists will discuss some key results from major field studies conducted in Mexico City and So Paulo, Brazil. Among the highlights, scientists find that the chemistry of emissions from developing megacities differs from what's brewing over established megacities, particularly with regard to aerosols important to climate change and health.

Participants

• Luisa T. Molina: Principal Research Scientist, Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA; Director, Molina Center for Energy and the Environment (MCE2) Lead scientist, MCMA-2006 /MILAGRO;
• Jeffrey S. Gaffney: Chair and Professor, Department of Chemistry University of Arkansas, Little Rock, Arkansas, USA; Lead Scientist, MAX-Mex/MILAGRO;
• Paulo Artaxo: Institute of Physics, University of So Paulo, Rua do Mato, Travessa R, 187 So Paulo, SP, Brazil; Member, Global Air Pollution Forum.

Session: A23C

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Tuesday, 22 May
1400h

Keeping Track of Earth's Slippers

One of the great geophysical advances in the last decade has been the development of Global Positioning System (GPS) receivers as tools for directly measuring plate tectonics. Using networks of GPS receivers that routinely gauge deformation in plate boundary zones around the world, scientists find that plates don't just creep along at a steady pace. Rather, they sometimes suddenly speed up or even change directionactions known as slow slip events (SSE) or transient deformation. Nowhere are SSEs more dramat
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Contact: Peter Weiss
pweiss@agu.org
202-777-7507
American Geophysical Union
18-May-2007

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