Sediment Deformations Due to Paleoseismic Events

• 作者: Nils-Axel M?rner
• 来源期刊: 地震研究(英文)
• 学科: 地球科学
• 关键词: Deformations Paleoseismics LIQUEFACTION TURBIDITES Varved CLAY Tsunamites
• 年，卷（期）: 2019,（4）
• 页码范围: 313-331
• 页数: 19页
• 分类号: P31

摘要

There are many different processes generating soft-sediment deformation. This paper is confined to deformations generated by paleoseismic events in Sweden. The Paleoseismic Catalogue of Sweden includes 66 events. The structural characteristics and driving forces of liquefaction are discussed in details. “Crypto-deformations” refer to a special type of fluidization not affecting the sedimentary bedding itself, but the internal orientation of the ChRM and AMS carrying particles. Extensive turbidites are formed at some events. They constitute useful “marker-varves”. Out of the 66 paleoseismic events, 31 are dated by varves as to a single year (in one case even to the season of a year). Tsunamites are recorded from 19 of the paleoseismic events;some with wave-heights up to 15 - 20 m.