Crystal Wespestad's research while affiliated with Colegio Bennett Cali Colombia and other places
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Publications (7)
Monitoring is essential to ensure that environmental goals are being achieved, including those of sustainable agriculture. Growing interest in environmental monitoring provides an opportunity to improve monitoring practices. Approaches that directly monitor land cover change and biodiversity annually by coupling the wall-to-wall coverage from remot...
This chapter introduces change detection mapping. It will teach you how to make a two-date land cover change map using image differencing and threshold-based classification. You will use what you have learned so far in this book to produce a map highlighting changes in the land cover between two time steps. You will first explore differences betwee...
Tropical forests are being disturbed by deforestation and forest degradation at an unprecedented pace (Hansen et al. in Science 342:850–853, 2013; Bullock et al. in Glob Change Biol 26:2956–2969, 2020). Deforestation completely removes the original forest cover and replaces it with another land cover type, such as pasture or agriculture fields. Gen...
Monitoring is essential to ensure that environmental goals are being achieved, including those of sustainable agriculture. Growing interest in environmental monitoring provides an opportunity to improve monitoring practices. Approaches that directly monitor land cover change and biodiversity annually by coupling the wall-to-wall coverage from remot...
Widespread surface creep is observed across a number of active faults included in the United States (US) National Seismic Hazard Model (NSHM). In northern California, creep occurs on the central section of the San Andreas fault, along the Hayward and Calaveras faults through the San Francisco Bay Area, and to the north coast region along the Maacam...
This report describes geodetic and geologic information used to constrain deformation models of the 2023 update to the National Seismic Hazard Model (NSHM), a set of deformation models to interpret these data, and their implications for earthquake rates in the western United States. Recent updates provide a much larger data set of Global Positionin...
While deforestation has traditionally been the focus for forest canopy disturbance detection, forest degradation must not be overlooked. Both deforestation and forest degradation influence carbon loss and greenhouse gas emissions and thus must be included in activity data reporting estimates, such as for the Reduced Emissions from Deforestation and...
Citations
... The purely elastic block model of Zeng and Shen (2016) does not inherently account for the transient effects of prior earthquakes (e.g., "ghost transients," from Hearn et al., 2013) potentially leading to discrepancies between geodetically-and geologically-determined long-term slip rates. These rates can be corrected by including the effects of postseismic transients (e.g., Guns et al., 2020;Kreemer & Young, 2022) or estimating the deviation from steady average velocity rates (Hearn et al., 2013;Pollitz, Evans, Field, et al., 2022;. Nevertheless, using fault-based models, the moment accumulation rate for each of the fault can be discretely computed. ...
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... The most robust estimate of the deep slip rate, derived from Bayesian modeling, is 7.5 ± 0.7 mm/yr below a depth of 13 km (Murray et al., 2014). Estimates of how much of this slip is taken up by creep varies from the fault slipping freely at all depths (Freymueller et al., 1999) to spatially variable patterns of creep along the fault length (Murray et al., 2014;Lienkaemper et al., 2014;Johnson et al., 2022a). Alinement arrays, restricted to a handful of locations along the fault (McFarland et al., 2016;Fig. ...
... Generally, a larger proportion of non-forested areas in a forest patch is thought to result from highintensity disturbance as opposed to forest patches with a closed canopy (Frolking et al., 2009). Human disturbances such as selective tree removal, which is common in Nepal, would thus reduce tree cover (Aryal et al., 2021;Shrestha et al., 2013) The correlation between topographic attributes and forest carbon was significant, reflecting the impact of topography on forest habitat quality through its influence on soil depth, precipitation, water redistribution and storage capacity in the mountains. ...
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