【摘要】：喜馬拉雅構(gòu)造結(jié)位于印度與歐亞板塊碰撞的前緣,其內(nèi)部的南迦巴瓦峰地區(qū)隆升速率大于周邊區(qū)域,被認(rèn)為是東構(gòu)造結(jié)的核心部位(隆升中心)。近期區(qū)域地震觀測(cè)結(jié)果表明,南迦巴瓦峰地區(qū)地震活動(dòng)較弱,而其東南側(cè)區(qū)域地震活動(dòng)頻繁。為了研究東構(gòu)造結(jié)地區(qū)目前的地球動(dòng)力學(xué)特征,文中利用DEM數(shù)據(jù)分析了南迦巴瓦峰及其西北、東南兩側(cè)和阿薩姆東北部區(qū)域的高程頻率分布及面積高程積分曲線。結(jié)果顯示,南迦巴瓦構(gòu)造結(jié)區(qū)域?qū)儆谇治g的壯年期,區(qū)域構(gòu)造隆升和剝蝕作用已經(jīng)達(dá)到高度平衡的狀態(tài),受到高原氣候影響,該地區(qū)剝蝕作用相對(duì)較弱,表明南迦巴瓦構(gòu)造結(jié)區(qū)域目前隆升相對(duì)緩慢。西北、東南側(cè)以及阿薩姆東北部區(qū)域地貌均表現(xiàn)為年輕的演化階段,屬于侵蝕的幼年期,阿薩姆東北部地區(qū)地貌更接近幼年期早期階段。西北側(cè)的地貌演化階段反映了區(qū)域侵蝕能力較小,仍屬于高原氣候區(qū);南迦巴瓦峰東南側(cè)至阿薩姆區(qū)域受到南亞熱帶季風(fēng)的影響,降雨充沛,遭受強(qiáng)烈的侵蝕作用,區(qū)域尚屬于侵蝕的幼年期,且阿薩姆東北部地貌發(fā)育程度更低,表明南迦巴瓦構(gòu)造結(jié)以東地區(qū)構(gòu)造隆升非常強(qiáng)烈,隆升速率最大的地區(qū)位于阿薩姆東北部。文中認(rèn)為,在現(xiàn)今印度板塊向N推進(jìn)的模式下,喜馬拉雅東構(gòu)造結(jié)核心部位(隆升中心)向SE發(fā)生了偏移,新的核心部位可能位于阿薩姆東北部區(qū)域,該地區(qū)隆升強(qiáng)烈,構(gòu)造應(yīng)力積累發(fā)生大地震的可能性較大。
[Abstract]:The Himalayan tectonic junction is located at the front edge of the collision between India and Eurasia plate, and the uplift rate of the Nankabawan region is larger than that of the surrounding area, so it is considered to be the central part of the eastern tectonic junction (uplift center). Recent regional seismological observations show that the seismicity is relatively weak in the Nangarbaawan region and frequent in the southeastern part of the region. In order to study the current geodynamic characteristics of the eastern tectonic junction area, the elevation frequency distribution and area elevation integral curves of the South Ghabawar Peak and its northwest, southeast and northeast Assam regions are analyzed by using DEM data. The results show that the area of Nangabawa tectonic junction belongs to the full age of erosion. The regional tectonic uplift and denudation have reached a highly balanced state, which is affected by the climate of the plateau, and the denudation is relatively weak in this area. It shows that the uplift of the Nanjiabawa tectonic junction is relatively slow at present. The regional geomorphology of northwest, southeast and northeast of Assam shows a young evolutionary stage, which belongs to the early stage of erosion, and the geomorphology of northeast Assam is closer to the early stage of infancy. The geomorphological evolution stage in the northwestern side reflects that the regional erosion capacity is relatively small and still belongs to the plateau climate zone, and the region from southeast to Assam is affected by the South Asian Tropical Monsoon, with abundant rainfall and strong erosion. The area still belongs to the infancy of erosion, and the geomorphology of northeast of Assam is lower, which indicates that the uplift is very strong in the area east of the Nangabawa tectonic junction, and the area with the highest uplift rate is located in the northeast of Assam. In this paper, it is considered that the core of the eastern Himalayan tectonic junction (uplift center) has shifted to SE under the current pattern of the Indian plate moving toward N, and the new core may be located in the northeastern part of Assam, which is a strong uplift. Tectonic stress accumulation is more likely to occur large earthquakes.
【作者單位】： 中國(guó)地震局地質(zhì)研究所活動(dòng)構(gòu)造與火山重點(diǎn)實(shí)驗(yàn)室;
【基金】：中國(guó)地震局地震行業(yè)科研專項(xiàng)(2015419024)資助
【分類號(hào)】：P315.2

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