{"id":32866,"date":"2023-02-28T06:47:22","date_gmt":"2023-02-28T05:47:22","guid":{"rendered":"https:\/\/karmaka.de\/?p=32866"},"modified":"2023-10-25T13:23:32","modified_gmt":"2023-10-25T11:23:32","slug":"computation-of-a-possible-tunguskas-strewn-field","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=32866","title":{"rendered":"Computation of a possible Tunguska&#8217;s strewn field<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Albino Carbognani, Mario Di Martino, Giovanna Stirpe<\/p>\n\n\n\n<p><strong>Update (25 October 2023)<\/strong>: Icarus, In Press, Journal Pre-proof, Available online 25 October 2023<br><a rel=\"noreferrer noopener\" href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0019103523004244\" target=\"_blank\"><strong>LINK<\/strong><\/a><\/p>\n\n\n\n<p>draft version (10 October 2023):<\/p>\n\n\n\n<p><a href=\"https:\/\/arxiv.org\/pdf\/2302.13620\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;On June 30, 1908, at about 0h 14.5 m UTC, the Tunguska Event occurred, most likely caused by the fall of a small stony asteroid of about 50-80 meters in diameter over the basin of the Tunguska River (Central Siberia). The first expedition was made by the geologist Leonid Kulik 19 years after the event, and macroscopic meteorites have never been found around epicenter. In this paper, we want to establish whether stony macroscopic fragments could have survived the TCB\u2019s airburst (Tunguska Cosmic Body) and where they might have fallen. For this purpose, we have implemented a fall model to describe the mass ablation, pancake expansion, airburst and fragments\u2019s dark flight. In our scenario, the fragments have a higher mean strength than the main body due to Weibull\u2019s law. The results, for a TCB with a kinetic energy of 15 Mt, atmospheric entry speed in the range of 11\u201320 km\/s, trajectory inclination of 35\u00b0 and average strength in the range of 3\u201370 MPa, tell us that for a macroscopic fragment with a mean strength between 14\u201385 MPa would be possible to survive the high pressure and temperature airburst to reach the ground. The falling speed of the fragments is in the range of 0.8\u20130.5 km\/s, which favoured their burial in the permafrost. The range of mean strength values for the TCB\u2019s macroscopic fragment appears physically plausible if we consider the fall of Carancas in 2007, with an estimated strength of 20\u201340 MPa. So our possible strewn field, computed for a typical fragment\u2019s speed of 10 \u00b1 3 km\/s, is located about 11 km North-West from the epicenter, with an area of about 140 km\u00b2. Finally, Cheko Lake, which by some authors is considered an impact crater, falls about 3.5 km outside the strewn fields at 3 sigma level and it is unlikely that it could be a real impact crater: only if the TCB\u2019s trajectory had an azimuth in the range 150\u00b0\u2013180\u00b0 would be in the strewn field area, but this is not consistent with the most likely trajectory azimuth.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Albino Carbognani, Mario Di Martino, Giovanna Stirpe Update (25 October 2023): Icarus, In Press, Journal Pre-proof, Available online 25 October 2023LINK draft version (10 October 2023): PDF (OPEN ACCESS) &#8220;On June 30, 1908, at about&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96],"tags":[1301,645],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/32866"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=32866"}],"version-history":[{"count":3,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/32866\/revisions"}],"predecessor-version":[{"id":34431,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/32866\/revisions\/34431"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=32866"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=32866"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=32866"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}