Marten Geertsema

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The Gorkha earthquake (magnitude 7.8) on 25 April 2015 and later aftershocks struck South Asia, killing ~9000 people and damaging a large region. Supported by a large campaign of responsive satellite data acquisitions over the earthquake disaster zone, our team undertook a satellite image survey of the earthquakes' induced geohazards in Nepal and China and(More)
At least thirty-eight, large, catastrophic landslides, each either larger than 0.5 Mm or longer than 1 km, have occurred in northern British Columbia in the last three decades. The landslides include low-gradient flowslides in cohesive sediments, long-runout rock slides (rock avalanches), and complex rock slide-flows. The flowslides have occurred in a(More)
Defi nitions and criteria for the landslide hazard ratings currently used in terrain stability mapping for forestry in British Columbia are strongly oriented toward shallow translational landslides, primarily the likelihood of initiation of debris slides and associated debris fl ows. However, deep-seated landslides, ranging from earthfl ows to slow slides(More)
Understanding and managing landslides and soil erosion can be challenging in British Columbia. Hillslope processes occur on a complex template, composed of a wide array of topographies, climates, geologies, and ecosystems (Chapter 2, “Physiography of British Columbia”). British Columbia is a diverse province with mountain ranges and incised plateaus. The(More)
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