https://www.evagolos.com/from-the-field daily 0.75 2022-11-11 https://www.evagolos.com/from-the-field/coming-soon monthly 0.5 2022-11-11 https://www.evagolos.com/from-the-field/blog-post-title-one-sd5r9 monthly 0.5 2022-04-08 https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/1634843182330-IRCIQ3BHWGAMYDAP8BSB/59725C60-C1CF-4C4F-BA3B-82A05F12E6F4.jpeg From the Field - Oceanic Adventures - Make it stand out Sunrise from my hotel room during the pre-trip quarantine. https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/67fc0774-ae92-4b9c-8f14-0376bd28b6e9/3CE792A0-578F-4076-ACC2-7C0CA235933D.jpg From the Field - Oceanic Adventures - Make it stand out One of many rock samples from the ocean floor. The black material is mostly manganese from reaction with seawater; only the center contains unaltered rock. https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/1e24bcad-fb21-4808-a928-5af06de8e8df/F333B183-84AD-4BAB-8E55-58FA4ABBA0C0.jpeg From the Field - Oceanic Adventures - Make it stand out Sunrise from the RV Roger Revelle. https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/1634863019147-3MUHHY0P8FP0KKSEZ9C2/765B7C71-2059-4E10-8B78-3D54E383B4F9.jpeg From the Field - Oceanic Adventures Here are a few pictures of OBS instruments returning. The yellow box is a flotation device to bring it up to the surface; the white part stores the battery and data logger; the green ball that’s dangling is the sensor which recorded seafloor ground motion from earthquakes. The red flag is a stylish little accessory to help us spot it from deck. Tagging (attaching a hook while the OBS is bobbing in the water) is definitely a skill. Even after 30 recoveries, it was still exciting to see another OBS coming aboard! https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/1634863901594-H7F30XWO79M3ZO59UUQ8/3822A433-30D7-4B5E-9A13-8491F7AD7261.jpeg From the Field - Oceanic Adventures A birds-eye view of an OBS recovery operation is shown to the right. Not all recoveries were as scenic; the fearless science team and techs braved all sorts of weather and sea conditions at all times of day. In fact, we separated into shifts in order to work continuously. Thanks to the hard work of all involved, we were able to successfully recover all 30 instruments with time to spare. https://www.evagolos.com/about daily 0.75 2024-08-05 https://www.evagolos.com/contact daily 0.75 2022-08-23 https://www.evagolos.com/publications daily 0.75 2024-08-08 https://www.evagolos.com/news daily 0.75 2025-06-30 https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/0a26f9ab-7b84-40bc-a42b-6ed4e66f37f7/IMG_6965.jpg https://www.evagolos.com/home daily 1.0 2025-06-30 https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/83675a7e-7979-4ca2-a82c-6a855ef005d4/IMG_6152.jpg Home https://www.evagolos.com/research daily 0.75 2024-07-17 https://www.evagolos.com/research/imaging-a-slippery-subduction-zone-in-alaska monthly 0.5 2024-07-17 https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/d3e1edb1-1577-460c-9d8e-f7f3883d300b/Mod_from_Iwamoto.jpg https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/0798af1e-a470-43f3-8729-b7979187c682/BADGERstns.png https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/123b78c3-4926-4f2c-be22-7f53b1ae0195/BA05.jpg https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/d6bc1163-3fa3-494d-b931-40e442fe4530/PXL_20230521_185154853.MP.jpg https://www.evagolos.com/research/interpretation monthly 0.5 2021-07-30 https://www.evagolos.com/research/lithosphere-swus monthly 0.5 2022-03-29 https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/519cc352-709a-4d72-8f96-7337b108588a/GrandCanyon.jpg Research - Lithospheric Structure in the Southwestern United States - Make it stand out The high topography of the Colorado Plateau has puzzled geophysicists for decades. It is also responsible for spectacular erosional features such as the Grand Canyon, as shown in a photo I took from the North Rim in September 2021. https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/eb4eab1d-8b81-40d2-8660-5793a92d84ff/LAB_and_MLD_revision.png Research - Lithospheric Structure in the Southwestern United States - Make it stand out a) Depth of LAB below the southwestern US. The diamonds represent locations of volcanics, colored according to age. b) Location of shallower gradient than LAB (inferred Mid-Lithospheric Discontinuity), with volcanic ages of 1 million years or younger only. Names of geologic provinces: BNR - Basin and Range; CP - Colorado Plateau; RG - Rio Grande Rift; SN - Sierra Nevada Batholith. Figure from Golos & Fischer (2022). https://www.evagolos.com/research/tomography-us monthly 0.5 2022-03-29 https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/f30419a9-0e42-4366-88d9-cc201c1bf182/Copy+of+Tomo_MITPS.png Research - Tomographic Imaging of the Contiguous United States Slices through (left) Vp, (center), Vs, and (right) Vp/Vs ratio anomalies. Thick black lines denote various geologic areas. https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/547af4b1-5f32-410f-8c4b-f9b51cc2debc/XSA_v428.jpg Research - Tomographic Imaging of the Contiguous United States - Our results show that the joint inversion of both types of data does indeed produce a model that improves on the model from either type of data alone. The joint inversion model contains good resolution in three dimensions. By reducing the artifacts from vertical smearing, we are able to image two distinct high-Vs anomalies in the eastern US: both a shallow anomaly attributed to the cold, fast, cratonic lithosphere; and a separate feature around 400-600 km depth, attributed to a remnant from the subducted Farallon slab. We even see evidence of a slow anomaly below the Yellowstone Hotspot (denoted with “Y” on the figure to the right, from Golos et al. (2020)), which may extend into the lower mantle. For more information, check out our JGR paper. https://images.squarespace-cdn.com/content/v1/60f0b66550eecf13e534bd94/6b269f17-294f-4615-91b8-8ce615a1467a/MITS_for_website.001.jpg Research - Tomographic Imaging of the Contiguous United States - Make it stand out Vs anomalies from (left column) only surface waves, (center) only body waves, and (center) joint inversion with both surface and body waves. By convention, red colors are where waves travel more slowly and blue, more quickly.