Fall 2018


September 28, 2018

Speaker: J. R. Skok, SETI Institute

Title: Seeking Signs of Life in Ancient Martian Hot Springs


October 5, 2018

Speaker: Margaret Avery, UC Berkeley

Title: Linking long-term paleomagnetic observations at Earth’s surface to the dynamics of the outer core using numerical geodynamo simulations


October 12, 2018

Speaker: Sylvain Barbot, Earth Observatory of Singapore

Title: Inside the subduction earthquake factory

barbot


October 19, 2018

Speaker: S. Mostafa Mousavi, Stanford University

Title: Application of machine learning techniques for seismic signal processing

mostufa


October 26, 2018

Speaker: Virginia Gulick, SETI Institute/NASA Ames

Title: Gully Formation on Mars: Did Water Play a Role?

ginny


November 2, 2018

Speaker: Jared Kluesner, USGS

Title: 3D insights into deformation, fluid-flow, and submarine slope failure in the Santa Barbara Channel<

 jared


November 9, 2018

Speaker: Wes Thelen, USGS

Title: The Extraordinary 2018 eruption of Kilauea Volcano

wes


November 16, 2018

Speaker: Maitrayee Bose, Arizona State University

Title: How extraterrestrial dust grains constrain the early history of the Solar Nebula 

cosmo


November 30, 2018

Speaker: Biondo Biondi, Stanford

Title: Opportunities and challenges of fiber-optic seismology for permanent monitoring of subsurface processes

biondi

Graphic rendering of seismic data recorded under Stanford University campus by our DAS array. Graphics are courtesy of Stamen Design, San Francisco, CA


Abstract: Continuous seismic monitoring can be a crucial tool to provide early warning of potentially hazardous conditions developing in the subsurface, as well as monitoring the flow of natural resources such as water and hydrocarbons. However, the cost of continuous monitoring is a significant obstacle to its widespread application. Distributed Acoustic Sensors (DAS) arrays have the potential of enabling cost-effective continuous and spatially dense seismic monitoring over large areas. By leveraging the preexisting fiber infrastructure deployed for telecommunication purposes, we could build large seismic arrays under densely populated cities around the world.
Starting the beginning of September 2016, we have been continuously recording seismic data as sensed by a fiber-optic cable placed under Stanford University campus and measured by an OptaSense DAS system. Our “Stanford Fiber Seismic Observatory (S-FSO)” experiment aims at studying the feasibility of using a DAS array that record data using a fiber-optic cable “free-floating” in a PVC conduit buried in the ground. Our array has recorded hundreds of seismic events. Analysis of these events shows that the signal is highly repeatable and correlates well with the data recorded by a broadband seismometer located on campus. Furthermore, by analyzing the S-FSO data we have identified a few weak local events that were not catalogued in the USGS on-line earthquake catalogue. We are also using ambient (mostly anthropogenic) noise interferometry to estimate and monitor subsurface properties under the array. Data analysis has prompted us to develop new theoretical models of the data recorded by the fiber to better understand the recorded signal and the interferometric data.


December 7, 2018

Speaker: Dustin Schroeder, Stanford

Title: Laying the Foundation for Europan Radio Glaciology