The Incorporated Research Institutions for Seismology (IRIS) and the Seismological Society of America (SSA) are pleased to announce the selection of two speakers from the Earth science research community for the tenth annual IRIS/SSA Distinguished Lectures Series.
Announcing 2015 SpeakersView the 2015 flyer
Dr. Thorne Lay
Department of Earth and Marine Sciences,
University of California, Santa Cruz,
Santa Cruz, California
A Global Surge of Great Earthquakes and What We are Learning From Them
During the decade 2004-2014, 18 huge earthquakes with seismic magnitudes larger than 8.0 struck around the world, sometimes causing horrendous destruction and loss of life. The annual rate of such events was 2.5 times greater than had been experienced over the previous century of seismological observations. Deployment of global networks of very high-quality seismic, geodetic, and tsunami recording systems had preceded most of these events, allowing unprecedented signals to be recorded for these great earthquakes.
Geophysicists have analyzed the recorded waves and ground motions to determine details of each earthquake, advancing our understanding of these dangerous events. Most of the earthquakes have involved surprises, rapidly revising scientific ideas about the behavior of huge fault ruptures and indicating the need for improved mitigation efforts.
Dr. Doug Wiens
Department of Earth and Planetary Sciences,
Saint Louis, Missouri
Seismology in Antarctica: Revealing the Secrets of an Ice-covered Continent
The continent of Antarctica supports the largest ice sheets in the world. The history of the ice sheets is intertwined with the geological history of continent, involving processes such as mountain building, the response of the land to the weight of glaciers, and heat flow melting and lubricating the bottom of the ice sheet. Very little is known about the history of Antarctica because the ice sheets preclude the usual geological sampling and mapping, so seismology offers a method to “see through the ice” and understand the continent beneath. Recent advances in technology now allow autonomous seismographs to be deployed across the continent for the first time.
In this presentation I will discuss projects that are installing seismographs across Antarctica and summarize recent discoveries. New results reveal that East Antarctica represents an ancient continent, with an average geological age of greater than one billion years and with highlands supported by thick continental crust. In contrast, West Antarctica shows evidence of recent tectonic activity, and high heat flow that may lubricate the base of the ice sheet. The seismographs record earthquakes from magma movement associated with volcanoes beneath the ice. The high mantle temperatures suggest low mantle viscosity, such that the response of the land to ice mass changes will occur within a few hundred years. These insights are changing the way we model the recent history of the ice sheet.
Seismograms also provide important constraints on the movement and forces acting on the ice sheets. “Icequakes” ranging from very small cracking events near the surface of the ice sheet to massive crevassing and calving episodes produce unique seismic signals that help reveal the physics of ice movement. The largest signals come from a unique region on the Whillans Ice Stream, where a 100 mile-long section of the ice stream lurches forward twice a day, triggered by ocean tides, and sending seismic waves traveling across the entire continent. This unusual behavior may signal the slowing down of this ice stream in response to changes in the amount of water along the ice stream bed.
2015 Lecture Series Schedule
|January 31, 2015 9:00AM||Dr. Jean-Paul Ampuero||Earth's Cocktail Party: Deciphering the Physics of Earthquakes With Networks of Seismic Arrays||Rutgers, The State University of New Jersey|
|July 13, 2015 3:00PM||Dr. Thorne Lay||A Global Surge of Great Earthquakes and What We are Learning From Them||OMSI Science Pub, The Hollywood Theatre|
|October 23, 2015 3:00PM||Dr. Thorne Lay||A Global Surge of Great Earthquakes and What We are Learning From Them||Cleveland Museum of Natural History|
|October 26, 2015 3:00PM||Dr. Doug Wiens||Seismology in Antarctica: Revealing the Secrets of an Ice-covered Continent||OMSI Science Pub, The Venetian Theatre|
Dr. Meredith Nettles
Associate Professor of Earth and Environmental Sciences
Lamont-Doherty Earth Observatory,
Palisades, New York
Glacial Earthquakes: Using Seismic and GPS Observations to Map Changes in Glaciers and Ice Sheets Worldwide
The great ice sheets of Greenland and Antarctica are losing mass, transferring more than 500 billion tons of water to the ocean each year. Most of this ice enters the ocean from large outlet glaciers: rivers of ice draining giant ice reservoirs. Understanding the behavior of the outlet glaciers is critical for accurate prediction of sea-level rise. The outlet glaciers are changing rapidly, with large variations in flow speed, thickness, and extent. In Greenland, many of the largest glaciers also produce seismic signals the size of those from magnitude 5 earthquakes, strong enough to be recorded around the globe.
The number of glacial earthquakes is increasing, with six times as many earthquakes occurring in recent years as in the early 1990s. I'll discuss the discovery of these peculiar earthquakes, and show how combining earthquake data with GPS measurements from glaciers allows us to learn how the glaciers and ice sheets may be affected by changing environmental conditions. Ice, the tides, earthquakes, and meltwater combine in a fascinating and complex system with real implications for our lives, whether on the coast or in the middle of the continent.
Dr. Jean-Paul Ampuero
Assistant Professor of Seismology
California Institute of Technology,
Earth's Cocktail Party: Deciphering the Physics of Earthquakes With Networks of Seismic Arrays
2014 Lecture Series Schedule
|January 18, 2014 9:00AM||Dr. Gavin Hayes||Mitigating Disasters: Earthquake Response in the 21st Century||Southwestern Oregon Community College|
|January 24, 2014 7:00PM||Dr. Lara Wagner||Imaging the Ancient Margin: How the Southeastern United States Was Built (And Why You Should Care)||Rutgers, The State University of New Jersey|
|April 07, 2014 7:00PM||Dr. Meredith Nettles||Glacial Earthquakes: Using Seismic and GPS Observations to Map Changes in Glaciers and Ice Sheets Worldwide||OMSI Science Pub, The Hollywood Theatre|
|April 24, 2014 10:00AM||Dr. Gavin Hayes||Mitigating Disasters: Earthquake Response in the 21st Century||Seattle Town Hall|
|May 10, 2014 2:00PM||Dr. Jean-Paul Ampuero||Earth's Cocktail Party: Deciphering the Physics of Earthquakes With Networks of Seismic Arrays||Fernbank Science Center|
|September 23, 2014 6:00PM||Dr. Meredith Nettles||Glacial Earthquakes: Using Seismic and GPS Observations to Map Changes in Glaciers and Ice Sheets Worldwide||New Mexico Museum of Natural History and Science|
|October 14, 2014 2:30PM||Dr. Jean-Paul Ampuero||Earth's Cocktail Party: Deciphering the Physics of Earthquakes With Networks of Seismic Arrays||Noel Wein Public Library|
|November 12, 2014 2:00PM||Dr. Meredith Nettles||American Museum of Natural History|
The lecturers will be presenting talks aimed at general public audiences throughout 2014.
The Lecture Series is seeking museum, university, and other venues for this season's speakers.
All lectures must be arranged for general public audiences. Due to the nature of the funding source for this program, lectures can not be arranged as part of a University Department Colloquium Series.
General arrangements, including publicity, will be coordinated between IRIS, SSA and the sponsoring venue. The minimum desired audience size is 200. IRIS and SSA will cover all speaker costs and may also provide accompanying seismology displays and other outreach materials if feasible.For more information, please contact: Patrick McQuillan
IRIS Education and Outreach Program
Distinguished Lectureship Archive 2003 - 2013
|2013||Dr. Lara Wagner||Imaging the Ancient Margin: How the Southeastern United States Was Built (And Why You Should Care)|
|2013||Dr. Gavin Hayes||Mitigating Disasters: Earthquake Response in the 21st Century|
|2012||Dr. Miaki Ishii||Dissecting Giant Earthquakes: Things We Didn't Know|
|2012||Dr. Gregory Beroza||The Tortoise and the Hare: Slow vs Fast Earthquakes|
|2011||Dr. Wayne D. Pennington||Preparing for the Future: Scientific and Humanitarian Lessons from the Haiti and Japan earthquakes|
|2011||Dr. Beatrice Magnani||The New Madrid Earthquakes Two Hundred Years Later: What Have We Learned About Earthquakes at the Center of Tectonic Plates?|
|2010||Dr. Brian Stump||Forensic Seismology and Nucler Testing: The Detective Work of Seismologists|
|2010||Dr. Stephen Malone||Predicting Earthquakes and Volcanic Eruptions: What Can and Can't Now Be Done|
|2009||Dr. Aaron A. Velasco||Can a Large Earthquake in Another Country Cause One in Your Backyard?|
|2009||Dr. Richard C. Aster||Taking Earth's Pulse and Temperature Using Seismology: Roaring Oceans and Singing Icebergs|
|2008||Dr. Cliff Frohlich||Deep Earthquakes and the Secret of Seismology|
|2008||Dr. Uri ten Brink||Peace and Science in the Middle East|
|2007||Dr. Anne Sheehan||Seeing Beneath Mt. Everest: Probing a Breeding Ground of Destructive Earthquakes|
|2007||Dr. Brian Atwater||The Orphan Tsunami of 1700 - A Trans-Pacific Detective Story|
|2006||Dr. Mary Lou Zoback||The 1906 Earthquake - Lessons Learned, Lessons Forgotten, and Future Directions|
|2006||Dr. Ed Garnero||Vibrations From the Deep: Deciphering the Birth and Death of the Earth's Surface|
|2006||Dr. Seth Stein||Giant Earthquakes: Why, Where, When, and What We Can Do|
|2005||Dr. Michael Wysession||Earthquakes, Tsunamis, and a Modern Journey to the Center of the Earth|
|2005||Dr. Susan Hough||The Very Long Reach of Very Large Earthquakes|
|2004||Dr. David E. James||Revealing the Mysteries of the Earth's Deep Interior: Plates, Plumes, and the Birth of Modern Seismology|
|2004||David Wald||Rapid Earthquake Information: Citizen Science and New Tools for Emergency Response|
|2003||Dr. Roger Bilham||Death and Construction: Earthquakes on an Urban Planet|
|2003||Dr. Walter Mooney||The Discovery of the Earth: The Quest to Understand the Interior of our Planet|