發(fā)布時(shí)間：2018-04-23 19:22

  本文選題：接收函數(shù)H-κ疊加 + 波形反演��； 參考：《地球物理學(xué)報(bào)》2016年11期

【摘要】：本文理論分析了具有不同沉積層和殼幔過渡帶結(jié)構(gòu)的接收函數(shù)及其相關(guān)的H-κ疊加結(jié)果,然后采用接收函數(shù)H-κ疊加和波形反演方法獲得了具有復(fù)雜構(gòu)造演化歷史的中北安納托利亞板塊的地殼厚度(H)、V_P/V_S(κ)和V_S結(jié)構(gòu).理論分析表明:厚的沉積層或沉積層和厚的殼幔過渡帶共存都會(huì)使H-κ疊加失效;漸變型殼幔過渡帶導(dǎo)致H-κ疊加的H位于過渡帶中間,且隨著頻率增大逐漸靠近過渡帶上方;倒轉(zhuǎn)型殼幔過渡帶導(dǎo)致H-κ疊加具有多極值,其結(jié)果可能反應(yīng)過渡帶內(nèi)最大波阻抗界面上的地殼結(jié)構(gòu);1km·s~(-1)的V_P變化會(huì)導(dǎo)致H-κ疊加的H變化7km,而κ變化較小.實(shí)際資料分析表明:中北安納托利亞H,κ和V_S具有強(qiáng)烈的橫向不均勻性,大部分區(qū)域沉積層厚度0.5km,局部地區(qū)殼幔過渡帶厚度3km;北安納托利亞斷層切穿地殼,在局部地區(qū)可能存在流體;研究區(qū)存在殘留古老的小陸塊體.本文研究表明,仔細(xì)分析接收函數(shù)波形和其隨方位角的變化特征且用其他地震學(xué)方法進(jìn)行約束,有助于采用H-κ疊加方法獲取復(fù)雜地殼結(jié)構(gòu)信息.
[Abstract]:In this paper, the reception function with different sedimentary layers and crust-mantle transition zone structures and its related H- 魏 superposition results are theoretically analyzed. Then the crustal thickness of the central and northern Anatolian plate with complex tectonic evolution history is obtained by using the reception function H- 魏 stack and waveform inversion method. The theoretical analysis shows that the coexistence of thick sedimentary layer or sedimentary layer and thick crust-mantle transition zone will invalidate H- 魏 superposition, and the H of H- 魏 superimposed transition zone is located in the middle of the transitional zone with the increase of frequency, and gradually approaches to the top of the transitional zone with the increase of frequency. The transition zone of crust and mantle leads to the multi-extreme value of H- 魏 superposition. The results may reflect the VSP variation of the crustal structure at the maximum wave impedance interface of 1 km / s ~ (-1) in the transition zone, which will lead to the change of H- 魏 superposition H by 7km, but the change of 魏 is relatively small. The analysis of the actual data shows that there are strong transverse inhomogeneity in the central and northern Anatolia (H, 魏 and V\ + + S), the thickness of the sedimentary layer in most areas is 0.5 km, the thickness of the crust and mantle transition zone in some areas is 3 km, the thickness of the North Anatolian fault is cut through the crust, There may be fluids in local areas, and there are ancient residual small landmasses in the study area. In this paper, it is shown that careful analysis of receiving function waveform and its variation with azimuth and constraint by other seismological methods are helpful to obtain complex crustal structure information by H- 魏 superposition method.
【作者單位】： 中國科學(xué)院測量與地球物理研究所大地測量與地球動(dòng)力學(xué)國家重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院地質(zhì)與地球物理研究所巖石圈演化國家重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院青藏高原地球科學(xué)卓越創(chuàng)新中心;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目(2013CB733203) 國家自然科學(xué)基金項(xiàng)目(41225016,41604056) 大地測量與地球動(dòng)力學(xué)國家重點(diǎn)實(shí)驗(yàn)室自主課題(Y509169216)資助
【分類號(hào)】：P315.2

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