UPCOMING EVENTS
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VIDEOS OF PAST EVENTS
We video-record these lectures for later viewing (see the Events > Past Events Videos on home page menu).
Click title or photo to see description of events and speakers background
2025-02-15 Jeff Tepper – Diamond: A Multifaceted Gem
LECTURE Diamond: A Multifaceted Gem Diamonds have been revered as precious stones for over 2000 years, yet they are composed simply of carbon, one of the most common elements on Earth. Their rarity arises from the fact that they form at extreme pressures deep in the Earth’s mantle and then are brought rapidly to the surface in CO2-rich explosive eruptions. No such eruptions have occurred in human history, but we know they occur only in the interiors of continents, where they produce narrow vertical ‘kimberlite pipes’ that are mined in Africa, Russia, and, more recently, Canada. Tiny diamonds with… Read more2025-02-15 Jeff Tepper – Diamond: A Multifaceted Gem
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2025-03-08 Dan Coe – Mapping Our Glacial Legacy
The Lecture: Mapping the Glacial Legacy of the Pacific Northwest Glaciers have shaped much of the Pacific Northwest’s landscape over the past 15,000 years. The Cordilleran ice sheet, repeated ice age floods, and expansive alpine glaciation have left their distinctive fingerprints on the topography of our region. Geologists and cartographers have been mapping and interpreting glacial landforms since the late 19th century. In the past decade, the Washington Geological Survey has created new maps that build upon this rich cartographic history by fusing older datasets and techniques with modern insights and technology, such as lidar. Using both historical and modern maps,… Read more2025-03-08 Dan Coe – Mapping Our Glacial Legacy
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2025-04-12 Dan Muhs – Tectonic Uplift in the Pacific Northwest
The Lecture: Subduction-related late Quaternary tectonic uplift and sea-level change in the Pacific NW and around the Pacific Rim In 1979, Seiya Uyeda and Hiroo Kanamori introduced a tectonic model with two end members of a subduction-boundary continuum: the “Chilean” type (shallow dip of the subducting plate, great thrust events, compression, and uplift of the overriding plate) and the “Mariana” type (steep dip of the subducting plate, no great thrust events, tension, and little or no uplift). The concept has been used to explain variable rates of Quaternary uplift around the Pacific Rim, and the paper has been cited over… Read more2025-04-12 Dan Muhs – Tectonic Uplift in the Pacific Northwest
0 comments
2025-02-15 Jeff Tepper – Diamond: A Multifaceted Gem
LECTURE Diamond: A Multifaceted Gem Diamonds have been revered as precious stones for over 2000 years, yet they are composed simply of carbon, one of the most common elements on Earth. Their rarity arises from the fact that they form at extreme pressures deep in the Earth’s mantle and then are brought rapidly to the surface in CO2-rich explosive eruptions. No such eruptions have occurred in human history, but we know they occur only in the interiors of continents, where they produce narrow vertical ‘kimberlite pipes’ that are mined in Africa, Russia, and, more recently, Canada. Tiny diamonds with… Read more2025-02-15 Jeff Tepper – Diamond: A Multifaceted Gem
2025-03-08 Dan Coe – Mapping Our Glacial Legacy
The Lecture: Mapping the Glacial Legacy of the Pacific Northwest Glaciers have shaped much of the Pacific Northwest’s landscape over the past 15,000 years. The Cordilleran ice sheet, repeated ice age floods, and expansive alpine glaciation have left their distinctive fingerprints on the topography of our region. Geologists and cartographers have been mapping and interpreting glacial landforms since the late 19th century. In the past decade, the Washington Geological Survey has created new maps that build upon this rich cartographic history by fusing older datasets and techniques with modern insights and technology, such as lidar. Using both historical and modern maps,… Read more2025-03-08 Dan Coe – Mapping Our Glacial Legacy
2025-04-12 Dan Muhs – Tectonic Uplift in the Pacific Northwest
The Lecture: Subduction-related late Quaternary tectonic uplift and sea-level change in the Pacific NW and around the Pacific Rim In 1979, Seiya Uyeda and Hiroo Kanamori introduced a tectonic model with two end members of a subduction-boundary continuum: the “Chilean” type (shallow dip of the subducting plate, great thrust events, compression, and uplift of the overriding plate) and the “Mariana” type (steep dip of the subducting plate, no great thrust events, tension, and little or no uplift). The concept has been used to explain variable rates of Quaternary uplift around the Pacific Rim, and the paper has been cited over… Read more2025-04-12 Dan Muhs – Tectonic Uplift in the Pacific Northwest
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ABOUT US
Our goal is to foster an understanding of Earth Science concepts by offering 5-8 illustrated lectures during the academic year and one or two summer field trips. We focus mainly, but not exclusively, on local and regional geologic features and issues (see yearly list under events). Membership and events are FREE and open to the public, although we gratefully accept donations to defray our expenses. QGS is an earth-science activity of the Jefferson Land Trust, which is located in Port Townsend, WA. We are in our 10th year here on the Quimper Peninsula.
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