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2010 - 2014年地震群期间的无震瞬变：波利诺断层带（意大利南部）M≥6.5级地震更长复发周期的证据？

Aseismic transient during the 2010-2014 seismic swarm: evidence for longer recurrence of M ≥ 6.5 earthquakes in the Pollino gap (Southern Italy)?

作者信息

Cheloni Daniele, D'Agostino Nicola, Selvaggi Giulio, Avallone Antonio, Fornaro Gianfranco, Giuliani Roberta, Reale Diego, Sansosti Eugenio, Tizzani Pietro

机构信息

Istituto Nazionale di Geofisica e Vulcanologia (INGV), Centro Nazionale Terremoti, via di Vigna Murata 605, 00143, Rome, Italy.

Consiglio Nazionale delle Ricerche (CNR), Istituto per il Rilevamento Elettromagnetico dell'Ambiente, via Diocleziano 328, 80124, Naples, Italy.

出版信息

Sci Rep. 2017 Apr 12;7(1):576. doi: 10.1038/s41598-017-00649-z.

DOI:10.1038/s41598-017-00649-z
PMID:28404990
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5429810/
Abstract

In actively deforming regions, crustal deformation is accommodated by earthquakes and through a variety of transient aseismic phenomena. Here, we study the 2010-2014 Pollino (Southern Italy) swarm sequence (main shock M 5.1) located within the Pollino seismic gap, by analysing the surface deformation derived from Global Positioning System and Synthetic Aperture Radar data. Inversions of geodetic time series show that a transient slip, with the same mechanism of the main shock, started about 3-4 months before the main shock and lasted almost one year, evolving through time with acceleration phases that correlate with the rate of seismicity. The moment released by the transient slip is equivalent to M 5.5, significantly larger than the seismic moment release revealing therefore that a significant fraction of the overall deformation is released aseismically. Our findings suggest that crustal deformation in the Pollino gap is accommodated by infrequent "large" earthquakes (M  ≥ 6.5) and by aseismic episodes releasing a significant fraction of the accrued strain. Lower strain rates, relative to the adjacent Southern Apennines, and a mixed seismic/aseismic strain release are in favour of a longer recurrence for large magnitude earthquakes in the Pollino gap.

摘要

在活跃变形区域，地壳变形通过地震以及各种短暂的非地震现象来实现。在此，我们通过分析全球定位系统和合成孔径雷达数据得出的地表变形，研究位于波利诺地震空区内的2010 - 2014年波利诺（意大利南部）地震群序列（主震M 5.1）。大地测量时间序列反演表明，一次与主震机制相同的短暂滑动在主震前约3 - 4个月开始，持续了近一年，随时间演变，其加速阶段与地震活动速率相关。短暂滑动释放的矩相当于M 5.5，显著大于地震矩释放，因此表明总体变形的很大一部分是以非地震方式释放的。我们的研究结果表明，波利诺地震空区内的地壳变形是通过不频繁的“大”地震（M≥6.5）以及释放大量累积应变的非地震事件来实现的。相对于相邻的亚平宁山脉南部，较低的应变速率以及地震/非地震应变释放的混合情况有利于波利诺地震空区内大地震更长的复发周期。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0e33/5429810/96e62df91c8a/41598_2017_649_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0e33/5429810/aa9a2ccd6196/41598_2017_649_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0e33/5429810/ec661495ca29/41598_2017_649_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0e33/5429810/6d3df9780c3c/41598_2017_649_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0e33/5429810/3e16ab7a6f60/41598_2017_649_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0e33/5429810/96e62df91c8a/41598_2017_649_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0e33/5429810/aa9a2ccd6196/41598_2017_649_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0e33/5429810/ec661495ca29/41598_2017_649_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0e33/5429810/6d3df9780c3c/41598_2017_649_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0e33/5429810/3e16ab7a6f60/41598_2017_649_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0e33/5429810/96e62df91c8a/41598_2017_649_Fig5_HTML.jpg

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Episodic tremor and slip on the Cascadia subduction zone: the chatter of silent slip.卡斯卡迪亚俯冲带上的间歇性震颤与滑动：无声滑动的颤动
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