Circum-Arctic mantle structure from global tomography – consistent with plate reconstructions?
I present a preliminary, global-scale tomographic P-velocity model, and discuss it with a focus on the Arctic hemisphere. The model was obtained from waveform inversion of teleseismic P-waves, specifically using the method of multi-frequency inversion, an extension of finite-frequency tomography tha...
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| Format: | Conference item |
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Copernicus Publications
2012
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| _version_ | 1826295840768000000 |
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| author | Sigloch, K |
| author_facet | Sigloch, K |
| author_sort | Sigloch, K |
| collection | OXFORD |
| description | I present a preliminary, global-scale tomographic P-velocity model, and discuss it with a focus on the Arctic hemisphere. The model was obtained from waveform inversion of teleseismic P-waves, specifically using the method of multi-frequency inversion, an extension of finite-frequency tomography that systematically exploits the entire usable body-wave spectrum. The transition zone and mid-mantle are decently sampled, since the Arctic is surrounded by well-instrumented continents (Eurasia, North America, Japan). In addition, the past decade has seen the addition of a significant number of stations on Greenland and surrounding islands. I use a rigorously quality-controlled data set of broadband seismograms from IRIS, which is rather complete for the years 1999-2009, together with a smaller data set from the European data center ORFEUS. Global tomography models have rarely been discussed with a focus on the circum-Arctic region. Accordingly, this integrated investigation of tomography and plate tectonics is still in a reconnaissance stage. I compare my own model and a few other body-wave tomographies to a plate reconstruction model, in an attempt match up seismically fast anomalies (subducted slabs), with predicted paleo-trench locations. Shallow anomalies should correspond to recent subduction, deeper slabs to older subduction episodes. Slabs that are not overlain by a modeled trench at any time, or paleo-trenches without fast anomaly observed underneath, can point to gaps in our current understanding of the Arctic’s plate-tectonic evolution. |
| first_indexed | 2024-03-07T04:07:10Z |
| format | Conference item |
| id | oxford-uuid:c6912f6c-64fd-4ae9-a109-5b9d131aa7e5 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T04:07:10Z |
| publishDate | 2012 |
| publisher | Copernicus Publications |
| record_format | dspace |
| spelling | oxford-uuid:c6912f6c-64fd-4ae9-a109-5b9d131aa7e52022-03-27T06:39:00ZCircum-Arctic mantle structure from global tomography – consistent with plate reconstructions?Conference itemhttp://purl.org/coar/resource_type/c_5794uuid:c6912f6c-64fd-4ae9-a109-5b9d131aa7e5Symplectic Elements at OxfordCopernicus Publications2012Sigloch, KI present a preliminary, global-scale tomographic P-velocity model, and discuss it with a focus on the Arctic hemisphere. The model was obtained from waveform inversion of teleseismic P-waves, specifically using the method of multi-frequency inversion, an extension of finite-frequency tomography that systematically exploits the entire usable body-wave spectrum. The transition zone and mid-mantle are decently sampled, since the Arctic is surrounded by well-instrumented continents (Eurasia, North America, Japan). In addition, the past decade has seen the addition of a significant number of stations on Greenland and surrounding islands. I use a rigorously quality-controlled data set of broadband seismograms from IRIS, which is rather complete for the years 1999-2009, together with a smaller data set from the European data center ORFEUS. Global tomography models have rarely been discussed with a focus on the circum-Arctic region. Accordingly, this integrated investigation of tomography and plate tectonics is still in a reconnaissance stage. I compare my own model and a few other body-wave tomographies to a plate reconstruction model, in an attempt match up seismically fast anomalies (subducted slabs), with predicted paleo-trench locations. Shallow anomalies should correspond to recent subduction, deeper slabs to older subduction episodes. Slabs that are not overlain by a modeled trench at any time, or paleo-trenches without fast anomaly observed underneath, can point to gaps in our current understanding of the Arctic’s plate-tectonic evolution. |
| spellingShingle | Sigloch, K Circum-Arctic mantle structure from global tomography – consistent with plate reconstructions? |
| title | Circum-Arctic mantle structure from global tomography – consistent with plate reconstructions? |
| title_full | Circum-Arctic mantle structure from global tomography – consistent with plate reconstructions? |
| title_fullStr | Circum-Arctic mantle structure from global tomography – consistent with plate reconstructions? |
| title_full_unstemmed | Circum-Arctic mantle structure from global tomography – consistent with plate reconstructions? |
| title_short | Circum-Arctic mantle structure from global tomography – consistent with plate reconstructions? |
| title_sort | circum arctic mantle structure from global tomography consistent with plate reconstructions |
| work_keys_str_mv | AT siglochk circumarcticmantlestructurefromglobaltomographyconsistentwithplatereconstructions |