THE SEISMOGENIC MECHANISM OF STRONG EARTHQUAKES IN DAYAO-YAOAN AREA:STRUCTURE STRENGTHENING AND ACTIVITY OF THE NW STRIKE FOLD JOINTS

CHANG Zu-feng; ZHANG Yan-feng; LI Jian-lin

Volume 23 Issue 1

Feb. 2017

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CHANG Zu-feng, ZHANG Yan-feng, LI Jian-lin, 2017. THE SEISMOGENIC MECHANISM OF STRONG EARTHQUAKES IN DAYAO-YAOAN AREA:STRUCTURE STRENGTHENING AND ACTIVITY OF THE NW STRIKE FOLD JOINTS. Journal of Geomechanics, 23 (1): 161-172.

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THE SEISMOGENIC MECHANISM OF STRONG EARTHQUAKES IN DAYAO-YAOAN AREA:STRUCTURE STRENGTHENING AND ACTIVITY OF THE NW STRIKE FOLD JOINTS

Earthquake Administration of Yunnan Province, Kunming 650041, China

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Received: 2016-05-10
Published: 2017-02-01

Abstract

Abstract

At the start of this new century, four strong earthquakes of magnitude from 6.0 to 6.5 have successively occurred in Dayao-Yaoan region of central Yunan, we analyzed the structure and its evolution, combined with the modern motion characteristics and tectonic stress field of the Sichuan-Yunnan Block, to confirm the motion model and special seismogenic model of central Yunnan tectonic area and discuss the relationship between joints generated by folds and seismic. The research revealed that all these event sequences arranged in NW direction regularly, with highly consistent mechanical rupture mechanism of dextral strike slip along the NW strike joint plane revealed by focal mechanism solution. This area had no faults, but dominated by many NW strike Mesozoic fold structures. Abundant field investigations attested that plenty of longitudinal joints and transverse joints associated with folds have been developed intensively in this area, the former were more development than the latter. These joints become concentrated belts which array in unequal space, with a width of 30m to 50m and 20m to 30m per miter. On the joint plane, there are calcites and gabbro dykes developed as well as squeezed schistosition belt, fresh striations and soft fault gouge, all these phenomenas suggest that these joints are not only related to deep crust, but also active recently. It is inferred that:under the SSE movement of central Yunan block, these earthquakes produced, with the NW strike longitudinal joints structure strengthening, liking-up and rupturing under the present NNW orientation pressed stress fields. The active joints, just like active faults and active folds, are one of the most widespread active structures on Earth. Joint structures may become structure strengthening or activity belts and then become particular seismogenic structures under particular tectonic circumstance and special tectonic stress field.
- earthquake,
- joint generated by fold,
- conferted joint belt,
- structure strengthening belt

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