海原断裂带断层通道波观测与破碎带宽度

断层通道波是低速断层破碎带与高速围岩之间的边界相干多重反射形成的,其振幅和频率强烈依赖于断层的几何形态和物理性质,故能用于探测断裂带的内部结构.在宁夏海原西安州附近海原断裂带上,横跨1920年海原8.6级地震地表破裂带布设2条测线,接收测线之间人工爆破激发的断层通道波.每条测线由1台3分量数字地震仪组成,靠近破裂带台间距30～40 m,远离破裂带台间距增大至230～250 m.对测线1的台站接收到的一炮垂直道地震波数据进行了0.1～4.0 Hz频段的滤波,结果表明在S波到时之后存在多组强振幅、低频率、长波链的断层通道波.由断层通道波揭示的海原断裂带在西安州附近的断裂破碎带宽度约为250 m.     

Shear-wave velocity model of the Chukuo fault zone,Southwest Taiwan,from cross correlation of seismic ambient noise

The Chia-Nan (Chiayi-Tainan) area is in the southwestern Taiwan, and is located at the active deformation front of the collision of the Eurasian continental plate and the Philippine Sea plate, which causes complex folds as well as thrust fault systems in the area. The Chukuo fault zone is a boundary between the Western Foothill and the Western Coastal Plain in the Chia-Nan area. The nature of the crustal structure beneath the fault zone, especially the eastern part of the fault zone with mountain topography, has not been well known in detailed due to lack of drilling data as well as its limitation in using other geophysical methods, such as active source survey. In this study, we deployed an array with 11 broadband seismic stations to monitor the seismicity of the Chukuo fault zone. The array has recorded more than 1000 microearthquakes around this area. It provides an opportunity to use P- and S-wave travel time data to investigate the both the crustal P- and S-velocity in the fault zone, however due to the nature of the earthquake distribution, the ray density is relatively low at depth between 0 and 7 km. In addition, the uncertainty of S-wave reading for small earthquake also a limit in building precise S-velocity profile, Thus, we take the advantages of using cross-correlation of seismic ambient noise to investigate crustal S-velocity profile in the Chukuo fault area, especially in the mountain area where crustal faulting is a dominated phenomenon. The results indicate that S-wave velocity in the uppermost crust in the Chukuo fault zone is shown to be slower than previous studies. A low velocity layer exists at depth between 1 and 2 km in the east of the Chukuo Fault. The low S-velocity is related to a highly fractured upper crust due to intensive deformation caused by the orogenic process.     

Principal fault zone width and permeability of the active Neodani fault, Nobi fault system, Southwest Japan

The internal structure and permeability of the Neodani fault, which was last activated at the time of the 1891 Nobi earthquake (M8.0), were examined through field survey and experiments. A new exposure of the fault at a road construction site reveals a highly localized feature of the past fault deformation within a narrow fault core zone. The fault of the area consists of three zone units towards the fault core: (a) protolith rocks; (b) 15 to 30 m of fault breccia, and (c) 200 mm green to black fault gouge. Within the fault breccia zone, cataclastic foliation oblique to the fault has developed in a fine-grained 2-m-wide zone adjacent to the fault. Foliation is defined by subparallel alignment of intact lozenge shaped clasts, or by elongated aggregates of fine-grained chert fragments. The mean angle of 20°, between the foliation and the fault plane suggests that the foliated breccia accommodated a shear strain of γ<5 assuming simple shear for the rotation of the cataclastic foliation. Previous trench surveys have revealed that the fault has undergone at least 70 m of fault displacement within the last 20,000 years in this locality. The observed fault geometry suggests that past fault displacements have been localized into the 200-mm-wide gouge zone. Gas permeability analysis of the gouges gives low values of the order of 10⁻²⁰ m². Water permeability as low as 10⁻²⁰ m² is therefore expected for the fault gouge zone, which is two orders of magnitude lower than the critical permeability suggested for a fault to cause thermal pressurization during a fault slip.     

辽宁寒岭-偏岭平移断裂带特征及其形成动力机制

寒岭—偏岭平移断裂带位于辽宁东部 ,是中国东部郯庐断裂东盘的一个次级断裂。它控制着辽东鞍山—本溪地区地质体的分布。通过对平移断裂的展布、形态、伴随构造、牵引构造、位移方向和幅度、平移时间、断层尾端及动力学演化等特征研究 ,认为该断裂主要活动于晚三叠世 ,在晚侏罗世—早白垩世最为活跃 ,伴随岩浆侵入活动、火山喷发及陆相沉积。断裂带长约 1 3 0km ,中段位移最大可达 3 1km ,向东西两端逐渐减少。该断裂活跃时期主要表现为左行平移性质。构造的活动 ,主要与中生代时期欧亚大陆与伊佐奈岐板块、太平洋板块的相互作用有关     

断层导波研究加利福尼亚兰德斯和海克特曼恩地震断层带的四维特征(英文)

美国加利福尼亚州兰德斯和海克特曼恩地区于1992年和1999年先后发生7.4级和7.1级地震,分别在地面产生80km和40km长的断裂带。震后在断裂带布置的密集地震站台记录到明显的断层导波(fault-zone guided waves)。这些导波由断层带内的余震和人工震源激发产生,走时在S波之后,但具有比体波更强的振幅和更长的波列,并具有频散特征。通过对2～7 Hz断层导波的定量分析和三维有限差分数字模拟,获得了震深区断裂带的高分辨内部构造图像以及岩石的物理特性。数字模拟结果表明这些断裂带上存在被严重破碎了的核心层,形成低速、低Q值地震波导。核心破碎带宽约100～200 m,其内地震波波速降为周围岩石的40％～50％,Q值约为10～50。根据岩石断裂力学观点,这一低速、低Q值带可被解释为地震过程中处于断层动态断裂前端的非弹性区(或称之为破碎区,相干过程区)。在兰德斯和海克特曼恩断裂带测得的破碎区宽度与断裂带长度之比约为0.005,基本上符合岩石断裂力学预期的结果。观察到的断层导波还显示兰德斯和海克特曼恩地震中多条断层发生滑移和破碎。兰德斯地震时多条阶梯形断层相继断裂;而在海克特曼恩地震中,断裂带南北两端均出现分枝断裂,深处的分枝断裂较地表出现的破裂状况更为复杂。由三维有限元模拟的动态断裂过程表明,?     

El Pilar fault zone, northeastern Venezuela: Brief review

The El Pilar fault zone extends for about 700 km in an approximately E—W direction, from the Cariaco Trench to a point about 200 km northeast of Trinidad. It marks the southern boundary of the Araya—Paria peninsulas (eastern Caribbean Mts.) and of the Northern Range of Trinidad. It is characterized along its length by straight valleys, fault wedges, fumaroles, thermal springs, and sulfur deposits. The displacement along the El Pilar fault zone has been the subject of much controversy. Various authors recognize the following types of displacement: (1) southward thrust; (2) normal or graben faulting; (3) right-lateral strike-slip. The El Pilar fault zone probably represents a transform fault between the Caribbean and South America plates, and a hinge fault at its contact with the subduction zone east and south of the Lesser Antilles. It is planned to investigate the present-day movement along the El Pilar fault zone by high-precision geodetic methods, at the following localities: across the Gulf of Cariaco and at Casanay (central-southern Araya—Paria peninsulas).     

Seismic profiles across the middle Tan-Lu fault zone in Laizhou Bay, Bohai Sea, eastern China

The stratigraphic architecture, structure and Cenozoic tectonic evolution of the Tan-Lu fault zone in Laizhou Bay, eastern China, are analyzed based on interpretations of 31 new 2D seismic lines across Laizhou Bay. Cenozoic strata in the study area are divided into two layers separated by a prominent and widespread unconformity. The upper sedimentary layer is made up of Neogene and Quaternary fluvial and marine sediments, while the lower layer consists of Paleogene lacustrine and fluvial facies. In terms of tectonics, the sediments beneath the unconformity can be divided into four main structural units: the west depression, central uplift, east depression and Ludong uplift. The two branches of the middle Tan-Lu fault zone differ in their geometry and offset: the east branch fault is a steeply dipping S-shaped strike-slip fault that cuts acoustic basement at depths greater than 8 km, whereas the west branch fault is a relatively shallow normal fault. The Tan-Lu fault zone is the key fault in the study area, having controlled its Cenozoic evolution. Based on balanced cross-sections constructed along transverse seismic line 99.8 and longitudinal seismic line 699.0, the Cenozoic evolution of the middle Tan-Lu fault zone is divided into three stages: Paleocene–Eocene transtension, Oligocene–Early Miocene transpression and Middle Miocene to present-day stable subsidence. The reasons for the contrasting tectonic features of the two branch faults and the timing of the change from transtension to transpression are discussed.     

2022年1月8日青海门源MS 6.9地震地表破裂考察的初步结果及对冷龙岭断裂活动行为和区域强震危险性的启示

2022年1月8日青海门源M_S 6.9地震发生在青藏高原东北缘的祁连山断块内部,仪器震中位于海原活动断裂系西段的冷龙岭断裂带上,是该断裂系自1920年海原8.5级大地震后再次发生M>6.5的强震。考察结果的初步总结表明,此次门源地震产生了呈左阶斜列分布、总长度近23 km的南北两条破裂,在两者之间存在长约3.2 km、宽近2 km的地表破裂空区。南支破裂(F₁)出现在托来山断裂的东段,走向91°,长约2.4 km,以兼具向南逆冲的左旋走滑变形为主,最大走滑位移近0.4 m。北支主破裂(F₂)出现在冷龙岭断裂的西段,总长度近20 km,以左旋走滑变形为主,呈整体微凸向北东的弧形展布,包含了走向分别为102°、109°和118°的西、中、东三段,最大走滑位移出现在中段,为3.0±0.2 m。此外,在北支主破裂中—东段的北侧新发现一条累计长度约7.6 km、以右旋正断为主的北支次级破裂(F₃),累计最大走滑量约0.8 m,最大正断位移约1.5 m。综合分析认为,整个同震破裂以左旋走滑变形为主,具有双侧破裂特点,宏观震中位于北支主破裂的中段,其地表走滑位移很大可能与震源破裂深度浅有关,其中的右旋正断次级破裂可能是南侧主动盘向东运移过程中拖曳北侧块体发生差异运动所引起的特殊变形现象。印度与欧亚板块近南北向强烈碰撞挤压导致南祁连断块沿海原左旋走滑断裂系向东挤出,从而引发该断裂系中的托来山断裂与冷龙岭断裂同时发生破裂,成为导致此次强震的主要动力机制。在此大陆动力学背景下,以海原左旋走滑断裂系为主边界的祁连山断块及其周边的未来强震危险性需得到进一步重视。      

P波作用下跨断层隧道轴线地震响应分析

基于近场波动有限元方法并结合黏弹性人工边界条件,针对3D断层场地,通过求解等效二维场地地震响应,从而获得3D场地地震动输入的自由场响应,并将自由场响应转化为3D模型边界面上的等效节点力,从而建立含断层3D场地P波入射的倾斜输入方法。自由场算例验证所提方法具有较好精度,进而基于建立的输入方法,开展了跨断层隧道地震响应的数值模拟研究。数值模拟结果表明:在P波作用下,隧道跨断层部位处于拉、压、剪切的复杂受力状态,且断层处的隧道衬砌地震响应明显大于其他部位的地震响应;围岩的力学性质与断层的力学性质相差越大,断层处衬砌的地震响应放大越明显;断层处衬砌地震响应随断层深度的增加而增加。另外,跨断层隧道的地震响应受P波入射角度的影响较大,随P波入射角度的增加,断层处隧道衬砌的轴力、弯矩先增加后减小,而剪力具有逐渐减小的规律。     

鲜水河断裂带渐新世至早中新世两期变形相关混合岩的锆石U - Pb年代学及其意义

鲜水河断裂带是青藏高原东缘重要的走滑断裂带。沿该断裂带发育长约120 km、宽约3~5 km的混合岩。运动学和年代学资料表明其与鲜水河断裂带渐新世至早中新世的两期变形有关。第一期变形发生在32~27 Ma,混合岩显微构造显示强烈压扁机制,反映了沿鲜水河断裂带的挤压变形机制。第二期混合岩中两个淡色体的样品获得了25.06 Ma和20.9 Ma的锆石U Pb年龄,限定混合岩化的时间约为25~20 Ma。这期混合岩以发育左行走滑的矿物生长线理为特征,反映了走滑的应力体制。与这期混合岩密切相关的5块花岗岩样品均获得了20~19 Ma的锆石U Pb年龄,代表了混合岩化作用的结束。两期混合岩的发现限定了鲜水河断裂带新生代由挤压体制到左行走滑体制的转变,也即鲜水河断裂带新生代走滑起始时间27~25 Ma。该发现对于认识青藏高原东缘新生代的构造变形过程具有重要意义。     

First seismic record for intra-arc strike-slip tectonics along the Liquiñe-Ofqui fault zone at the obliquely convergent plate margin of the southern Andes

A temporal seismic network recorded local seismicity along a 130 km long segment of the transpressional dextral strike-slip Liquiñe-Ofqui fault zone (LOFZ) in southern Chile. Seventy five shallow crustal events with magnitudes up to M_w 3.8 and depths shallower than 25 km were observed in an 11-month period mainly occurring in different clusters. Those clusters are spatially related to the LOFZ, to the volcanoes Chaitén, Michinmahuida and Corcovado, and to active faulting on secondary faults. Further activity along the LOFZ is indicated by individual events located in direct vicinity of the surface expression of the LOFZ. Focal mechanisms were calculated using deviatoric moment tensor inversion of body wave amplitude spectra which mostly yield strike-slip mechanisms indicating a NE–SW direction of the P-axis for the LOFZ at this latitude. The seismic activity reveals the present-day activity of the fault zone. The recent M_w 6.2 event near Puerto Aysén, Southern Chile at 45.4°S on April 21, 2007 shows that the LOFZ is also capable of producing large magnitude earthquakes and therefore imposing significant seismic hazard to this region.     

滇西北程海断裂带主要古地震滑坡及其分布特征的构造解释

位于红河断裂带西北端,滇西北断陷带东侧的程海断裂带第四纪活动显著,沿断裂盆山地貌与高山峡谷地貌发育,地质灾害频发。综合利用目视解译与野外调查,对程海断裂带沿线滑坡调查发现,沿程海断裂带共发育各类滑坡940余个,含巨型滑坡61个、大型滑坡125个、中型滑坡316个、小型滑坡438个。这其中有32个巨型滑坡、61个大型滑坡分布在程海断裂带下盘,距断裂约5 km范围内的断层崖和断层三角面上。它们往往具有规模大、滑动距离远、有高速远程碎屑流为主要特征的动力学特性,属于程海断裂带上地震活动触发的古地震滑坡。对区内主要古地震滑坡的调查发现,大型特别是巨型古地震滑坡,主要集中分布在金官和程海盆地东侧,期纳盆地南部金沙江与程海断裂带交汇处,以及弥渡盆地西部。并且在垂向活动速率最大的程海断裂带北端最为发育,明显受程海断裂带不同段落活动的控制。结合程海断裂带晚新生代活动及青藏高原东南缘地壳变形特征的分析显示,程海断裂带端部更为强烈的活动性、更为频发的地震以及更多的古地震滑坡,是在川滇内弧带顺时针旋转及南汀河断裂、畹町断裂与理塘断裂的走滑拉分共同作用下,滇西北地区发生顺时针旋转变形作用的结果。     

Deep structure of the Nojima Fault, southwest Japan, estimated from borehole observations of fault-zone trapped waves

To estimate the deep structure of the southern part of the Nojima Fault, southwest Japan without the influence of near-surface structures, we analyzed the Love-wave-type fault-zone trapped waves (LTWs) recorded by a borehole seismometer at 1800 m depth. We examined the polarization, dispersion, and dominant frequency of the wavetrain following the direct S-wave in each seismogram to identify the LTW. We selected eight candidates for typical LTWs from 462 records. Because the duration of the LTW increases with hypocentral distance, we infer that the low velocity fault-zone of the Nojima Fault continues towards the seismogenic depth. In addition, since the duration of the LTW increases nonlinearly with hypocentral distance, we infer that the S-wave velocity of the fault-zone increases with depth. The location of events showing the LTW indicates that the fault-zone dips to the southeast at 75° and continues to a depth of approximately 10 km. We assumed a uniform low-velocity waveguide to estimate the average structure of the fault-zone. We estimated the average width, S-wave velocity, and Q_s of the fault-zone by comparing an analytical solution of the LTW with measured data. The average width, S-wave velocity, and Q_s of the fault-zone are 150 to 290 m, 2.5 to 3.2 km/s, and 40 to 90, respectively. Hence the fault-zone structure with a larger width and smaller velocity reduction than the fault-zone model estimated by previous surface observation is more suitable to represent the average fault-zone structure of the Nojima fault. The present study also indicated that the shallow layers and/or a shallow fault-zone structure drastically changes the characteristics of the LTW recorded at the surface, and therefore cause a discrepancy in the fault-zone model between the borehole observation and surface observation.     

局部断层场地对P波的散射影响研究

采用间接边界元法,借助Wolf的土层和半空间精确动力刚度矩阵和斜线荷载格林函数,在频域内求解了局部断层场地对P波的散射,着重分析了破碎带较窄断层两侧围岩动力响应的基本规律,以及场地动力特性对散射的影响。研究表明,破碎带断层对入射P波有着显著的影响,即使破碎带很窄,也可对P波产生很大的放大作用;层状场地动力特性对放大作用有显著的影响。     

与时俱进,发展中国大地构造学

郯庐断裂带的起源时间与型式仍然存在着很大的分歧。最近在大别山东缘早白垩世左旋走滑韧性剪切带中 ,发现了早期左旋走滑韧性剪切带。其中三处早期糜棱岩中白云母分别给出了( 188.7± 0 .7)Ma、( 189.7± 0 .6 )Ma、( 192 .5± 0 .7)Ma的40 Ar/ 3 9Ar坪年龄 ,指示了同造山走滑热事件。前陆沉积与变形构造也表明该断裂带在华北与华南板块碰撞中就发生了活动。郯庐断裂带内的造山期构造及旁侧的前陆沉积与变形构造特征 ,指示断裂带同造山运动为转换断层型式 ,并将大别—苏鲁造山带左行错移了约 35 0km ,同时苏鲁造山带发生逆时针旋转。在早白垩世滨太平洋构造活动中 ,该断裂进一步向北延伸 ,发生了约 2 0 0km的左行平移。因而 ,该断裂带起源于华北与华南板块的碰撞之中 ,其同造山运动与这两大板块的碰撞过程相伴生     

Multimode migration of scattered and converted waves for the structure of the Hikurangi slab interface, New Zealand

Reflectivity imaging of local earthquake seismograms has revealed the structure of the Hikurangi subduction interface at the location of two strong earthquakes that occurred in 1990. The earthquakes originated within the continental plate of the North Island of New Zealand and below in the subducting Pacific slab. We used seismograms from 500 well-located events in two earthquake sequences recorded by a small temporary seismograph deployment to directly image the structure and multiphase reflectivity of the plate interface. Synthetic tests of the imaging method show the effects of the poor 3-d geometric coverage afforded by the seismometer array. Kirchhoff summation image sections computed from synthetics show accurate depth imaging of backscattering interfaces. Phase-converting interfaces imaged with forward-scattered waves are smeared by poor ray coverage to 5-km depth inaccuracy and are only imaged over a small range of their horizontal extent. From the data, we computed image sections for P–P, P–S, S–P and S–S scattering. We mitigated imaging artifacts due to poor ray coverage with an obliquity factor, an antialiasing criterion and enhancement by resampling statistics. Imaging used a sharply layered velocity model. We tested for the effects of imaging with first-arriving headwaves by imaging through smoothly varying velocity models. For our ray geometry, early-arrival headwaves contribute little to the images.The plate interface appears as a 3–5-km thick P–P and possibly S–S backscatterer with 5° NW dip, offset 5 km down-to-the-NW above a normal fault in the slab. When illuminated from below, a wedge of the interface on the downdip side of the slab fault forms a very prominent P–P forward scatterer. The edges of the wedge forward-scatter some S–P and S–S energy, but an order of magnitude less than the P–P forward scattering. The imbalances between forward scattering of P and S energy suggest a wedge of subducted sediment retaining significant porosity but with rigidity close to that of surrounding rocks.     

Structural characteristics off Miyagi forearc region, the Japan Trench seismogenic zone, deduced from a wide-angle reflection and refraction study

The Japan Trench subduction zone, located east of NE Japan, has regional variation in seismicity. Many large earthquakes occurred in the northern part of Japan Trench, but few in the southern part. Off Miyagi region is in the middle of the Japan Trench, where the large earthquakes (M > 7) with thrust mechanisms have occurred at an interval of about 40 years in two parts: inner trench slope and near land. A seismic experiment using 36 ocean bottom seismographs (OBS) and a 12,000 cu. in. airgun array was conducted to determine a detailed, 2D velocity structure in the forearc region off Miyagi. The depth to the Moho is 21 km, at 115 km from the trench axis, and becomes progressively deeper landward. The P-wave velocity of the mantle wedge is 7.9–8.1 km/s, which is typical velocity for uppermost mantle without large serpentinization. The dip angle of oceanic crust is increased from 5–6° near the trench axis to 23° 150 km landward from the trench axis. The P-wave velocity of the oceanic uppermost mantle is as small as 7.7 km/s. This low-velocity oceanic mantle seems to be caused by not a lateral anisotropy but some subduction process. By comparison with the seismicity off Miyagi, the subduction zone can be divided into four parts: 1) Seaward of the trench axis, the seismicity is low and normal fault-type earthquakes occur associated with the destruction of oceanic lithosphere. 2) Beneath the deformed zone landward of the trench axis, the plate boundary is characterized as a stable sliding fault plain. In case of earthquakes, this zone may be tsunamigenic. 3) Below forearc crust where P-wave velocity is almost 6 km/s and larger: this zone is the seismogenic zone below inner trench slope, which is a plate boundary between the forearc and oceanic crusts. 4) Below mantle wedge: the rupture zones of thrust large earthquakes near land (e.g. 1978 off Miyagi earthquake) are located beneath the mantle wedge. The depth of the rupture zones is 30–50 km below sea level. From the comparison, the rupture zones of large earthquakes off Miyagi are limited in two parts: plate boundary between the forearc and oceanic crusts and below mantle wedge. This limitation is a rare case for subduction zone. Although the seismogenic process beneath the mantle wedge is not fully clarified, our observation suggests the two possibilities: earthquake generation at the plate boundary overridden by the mantle wedge without serpentinization or that in the subducting slab.     

碳酸盐岩断层破碎带构造成岩作用——以塔中Ⅰ号断裂带为例

多旋回叠合盆地断层具有异常复杂的构造变形与成岩演变,跨学科结合的构造成岩作用研究为断层破碎带演变机制与流体-岩石作用分析提供了新思路。结合塔中Ⅰ号断裂带构造解析和地化资料分析,探讨古老碳酸盐岩断层破碎带构造成岩作用的特殊性。结果表明,塔中Ⅰ号断裂带上奥陶统台缘带碳酸盐岩断层破碎带发育多类、多期构造成岩作用,明显不同于围岩。断层破碎带宽度高达2~4km,裂缝类型多样、纵横向变化大、开启程度较高。沿断裂带压实作用较弱且有差异,发现有碳酸盐岩压实变形带发育,并有后期裂缝与溶蚀作用形成的局部高渗透带。断层破碎带观测到多期压溶低角度缝合线与高角度构造缝合线,部分具有渗透性。多达4~5期不同类型胶结作用沿裂缝带发育,大气淡水胶结较多,胶结程度相对较弱。准同生期大气淡水溶蚀与局部风化壳岩溶主要沿断层破碎带发育,而且埋藏溶蚀作用较强,发育大型缝洞体与溶蚀孔洞。构造成岩作用揭示塔中Ⅰ号断裂带东段上奥陶统碳酸盐岩断层破碎带经历断裂萌芽期-形成期-定型期-复活扩张期-局部开启期等5期演变,不同演化期构造成岩作用有明显差异。构造成岩作用的多期差异活动是造成古老碳酸盐岩断层破碎带复杂性的重要因素。     

基于ALOS-PALSAR卫星数据对青藏高原东缘龙日坝断裂带地表构造伸展的研究及其大地构造指示意义

龙日坝断裂带位于青藏高原最东缘,呈北东-南西向延伸,平行于其东侧的龙门山断裂带,二者大约相距150 km。与龙门山断裂带不同的是,龙日坝断裂带在青藏高原东缘相关GPS测量中表现为一明显的速度梯度带,说明龙日坝断裂带可能具有很重要的构造属性。然而有关龙日坝断裂带的地表结构构造延伸问题一直悬而未决,目前还存在许多的争议,这在一定程度上也阻碍了我们对青藏高原东缘相对于印度-欧亚板块碰撞地球动力学响应的了解。在本次研究中,我们将首次采用ALOS-PALSAR卫星数据,并结合地表地质和前人的地球物理学研究成果,来监测与龙日坝断裂带的构造活动相关的细微地表形变,并由此控制龙日坝断裂带的延伸范围。研究结果表明,龙日坝断裂带与其西南侧的抚边河断裂带相交且近乎垂直,而非前人研究所认为的龙日坝断裂带延伸至其西缘的鲜水河断裂带。综合研究结果也为了解龙日坝断裂带的大地构造属性提供了数据支持。     

龙泉山断裂带隐伏断层氡气特征及其活动性分析

龙泉山断裂构造带作为龙门山推覆带的前陆隆起,严格控制了成都平原东边界,其活动性历来受到人们的关注。通过对龙泉山断裂带的氡气进行测量,可以有效地判断隐伏断层的位置及其活动性。测量结果显示,龙泉山断裂带北段东坡活动性强于西坡,主断层的活动性明显强于边缘隐伏断层,4条断层的活动性由强到弱依次为合兴场断层红花塘断层龙泉驿断层松林场断层。龙泉山断裂带同一条断层在地表由多个破碎带组成,其氡气异常特征与断层活动性和破碎带特征呈正相关性,即断层活动性越强,氡气异常特征越显著。龙泉山断裂带氡气平均异常浓度是背景值的9.6倍,将各异常带峰值浓度与背景值进行对比分析,大致归纳出了龙泉山地区隐伏断层活动性的相对判别标准。