Our active research environment connects researchers across disciplines and provides access to geophysical observations systems. Learn more about our research areas.

Infragravity Wave Radiation Across the Shelf Break

Berkeley Seismo Lab seismologists Barbara Romanowicz and Taka'aki Taira used Cascadia Array data to model the origin and radiation of infragravity waves in a JGR Oceans paper collaborating with partners in industry. Read the paper at JGR Oceans

From EOS Research Spotlight: On the Origins of Infragravity Waves:

"Waves on the surface of the ocean with long periods (1–5 minutes) and low frequencies (0.005–0.05 hertz) are called infragravity waves. These features, which appear to originate from physical interactions between wind-driven waves near coastlines, play an important role in sediment transport, coastal erosion, and other nearshore processes..."

Read more from EOS Research Spotlight

Research Areas

Seismic Noise: Taka'aki Taira, Michael Manga, and others are studying the speed of seismic waves beneath the Salton Sea to learn more about very shallow earth structure. This new tool is giving us clues to the inner workings of volcanoes and geothermal fields.

Fluids in Geophysical Processes: Why do volcanoes (only sometimes) erupt explosively? How do distant earthquake affect volcanic and geyser eruptions? How do pyroclastic flows interact with water? The Manga group studies geological processes involving fluids, including problems in physical volcanology, hydrogeology, and geomorphology, in an attempt to develop a better quantitative understanding of physical processes operating in the Earth.

InSAR and the Hayward Fault: The Bürgmann group modeled the Hayward and Calaveras Faults using InSAR radar satellite measurements. Results indicate the faults should be treated as a single system with potential to generate events with magnitudes significantly greater that 7, posing a higher seismic hazard than previously considered.

Seismic Sources: The seismic source (Dreger) group focuses on the use of seismic waveform data to investigate seismic sources (tectonic and non-tectonic), wave propagation, and various geophysical inverse problems, as well as developing robust automated procedures to analyze earthquakes as they occur. Current projects include studying induced seismicity at the Louisiana sinkhole and monitoring seismicity and ambient noise at the Geyers geothermal field.

ShakeAlert: ShakeAlert is the earthquake early warning system under construction in the United States. The BSL has been part of this effort since its inception in 2001, and continues to work towards public alerts.

MyShake MyShake is a global smartphone-based seismic network from the Allen group. The goal: provide global earthquake early warning.

Earth's Geodynamo: The Buffet group studies planetary magnetic fields to discover more about the dynamics and evolution of planetary interiors.

Imaging the Upper Mantle: The Romanowicz group's recent work suggests that the formation of mantle plumes, and the hotspots that form islands like Hawaii, is more complex than previously understood.

Alaska: Alaska is the last frontier for Earthscope. As the dense USArray spreads across the state we start to observe the dynamic processes responsible for the region’s earthquakes and volcanoes.

Fluids in Geodynamics: How does the internal structure of the mantle affect the formation and evolution of mantle plumes? Are there compositionally distinct layers at the base of the mantle? and do they influence the formation of plumes? Michael Manga's group studies the role of fluids in geodynamics.

Cascadia: The enigmatic Cascadia Subduction Zone lacks the continuous seismic activity seen at most convergent plate boundaries. The Allen group uses a variety of Earth imaging techniques to understand tectonic processes in the region.

Recent Research

Earthquakes and the Rainfall Cycle

Chris Johnson and Roland Bürgmann's research is featured in the video below.