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Continued continental weathering during snowball earth mitigated greenhouse gas buildup and prolonged global glaciation 雪球地球期间持续的大陆风化减缓了温室气体的积聚,延长了全球冰川作用
IF 4.8 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2026-01-22 DOI: 10.1016/j.epsl.2026.119837
Shintaro Kadoya , Mohit Melwani Daswani
Global glaciations, also known as snowball events, represent some of Earth’s most significant climate changes. The Neoproterozoic Sturtian glaciation lasted 4–15 times longer than the subsequent Marinoan glaciation, but the causes of this dramatic difference remain unclear. The standard theory attributes the termination of such events to a pause in silicate weathering due to the absence of liquid water on continents. However, recent evidence of syn-glacial dolomite precipitation suggests the possibility of continental weathering during global glaciation. We numerically investigate water-rock reactions under limited water and fresh rock supplies to identify the key factors controlling subglacial weathering and to evaluate their impact on the carbon cycle during global glaciation. The compositions of the discharge fluid and mineral assemblage reach their steady state over a timescale determined by the rate of fresh rock supply. These steady-state compositions are identical when the ratio of the meltwater production rate (Fw) to the fresh rock supply rate (Fr) is constant (Fw/Fr=k). Furthermore, the maximum estimated CO2 consumption could match Earth’s volcanic CO2 emission, assuming present-day Antarctic conditions for meltwater production and fresh rock supply. This finding contradicts the standard assumption that silicate weathering ceases during global glaciation and suggests a mechanism for the prolonged duration of the Sturtian glaciation. These results demonstrate that subglacial weathering represents a previously unrecognized feedback mechanism that could account for the dramatically different durations of Neoproterozoic snowball Earth events.
全球冰川,也被称为雪球事件,代表了地球上一些最重大的气候变化。新元古代的斯图特冰期比随后的马里诺冰期持续了4-15倍,但造成这种巨大差异的原因尚不清楚。标准理论将这些事件的终止归结为由于大陆上缺乏液态水而导致的硅酸盐风化暂停。然而,最近同冰期白云岩降水的证据表明,在全球冰期期间可能存在大陆风化作用。我们通过数值研究在有限的水和新鲜岩石供应条件下的水岩反应,以确定控制冰下风化的关键因素,并评估其对全球冰川时期碳循环的影响。排出流体和矿物组合的成分在一个由新鲜岩石供应速率决定的时间尺度内达到稳定状态。当融水产生速率(Fw)与新鲜岩石供应速率(Fr)之比恒定(Fw/Fr=k)时,这些稳态组成是相同的。此外,假设目前南极的融水生产和新鲜岩石供应条件,估计的最大二氧化碳消耗量可以与地球的火山二氧化碳排放量相匹配。这一发现与硅酸盐风化在全球冰期停止的标准假设相矛盾,并提出了一种延长斯图亚特冰期持续时间的机制。这些结果表明,冰下风化代表了一种以前未被认识到的反馈机制,可以解释新元古代雪球地球事件持续时间的巨大差异。
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引用次数: 0
Experimental determination of equilibrium fractionation of triple oxygen isotopes between dissolved sulfite species and water 溶解亚硫酸盐与水之间三氧同位素平衡分馏的实验测定
IF 4.8 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2026-01-22 DOI: 10.1016/j.epsl.2026.119862
Yu Wei , Hao Yan , Yan Fang
<div><div>Sulfite, a key intermediate sulfoxyanion in both the reductive and oxidative sulfur cycles, rapidly exchanges oxygen isotopes with ambient water under circumneutral to acidic conditions. Equilibrium oxygen isotope fractionation factors (<sup>18</sup><em>α</em> and <sup>17</sup><em>α</em>) between sulfite and water are therefore critical for interpreting the triple oxygen isotope composition of sulfate and for constraining sulfur cycling. However, equilibrium <sup>18</sup><em>α</em> values remain poorly constrained, with significant discrepancies among experimental and theoretical estimates, largely due to experimental challenges in determining sulfite oxygen isotope compositions and uncertainties in theoretical calibrations. Moreover, equilibrium <sup>17</sup><em>α</em> values have previously been derived only through theoretical calculation. In this study, we applied a pH-shifting technique to eliminate kinetic isotope effects during sulfite precipitation. We also employed a recently developed high-temperature reduction–discharge–CO<sub>2</sub>/O<sub>2</sub> isotope exchange technique to minimize the influence of sulfite hygroscopicity and precisely measured the triple oxygen isotope composition of sulfite equilibrated with water across a pH range of 4.60 to 8.89 and temperature range of 12 to 55 °C. Our results show a consistent, monotonic dependence of oxygen isotope fractionation between bulk sulfite (encompassing all S(IV)-oxyanions, including SO<sub>3</sub><sup>2–</sup> and the bisulfite isomers (HS)O<sub>3</sub><sup>–</sup> and SO<sub>2</sub>(OH)<sup>–</sup>) and water on both pH and temperature. We attribute the former to pH-controlled speciation of dissolved sulfite. From our data, we derived equilibrium fractionation factors for oxygen isotopes between bisulfite and water, and between sulfite (SO<sub>3</sub><sup>2–</sup>) and water:</div><div>1000ln<sup>18</sup><em>α</em><sub>bisulfite–H2O</sub> = (7.06 ± 1.06) × 10<sup>3</sup>/T – 8.80 ± 3.49</div><div>1000ln<sup>18</sup><em>α</em><sub>sulfite–H2O</sub> = (6.59 ± 1.32) × 10<sup>3</sup>/T – 12.56 ± 4.34</div><div>The associated mass-dependent fractionation exponents (<em>θ</em> = ln<sup>17</sup><em>α</em>/ln<sup>18</sup><em>α</em>) are temperature-independent within our studied range, with values of 0.5202 ± 0.0003 for bisulfite and 0.5155 ± 0.0008 for sulfite. These imply that the Δ′<sup>17</sup>O values of bisulfite and sulfite are offset by -0.152‰ and −0.143‰, respectively, from that of ambient water (assuming a reference slope of 0.5305) at 25 °C. Our findings offer new insights into the isotope fractionations associated with microbial sulfate reduction and pyrite oxidation. The observed pH-dependent variations in sulfate δ<sup>18</sup>O signatures during abiotic aerobic pyrite weathering may reflect oxidation of distinct sulfite species under variable pH conditions. Furthermore, the isotope fractionation observed between residual sulfate and water during microbial sulfat
亚硫酸盐是还原和氧化硫循环中一个关键的中间亚砜阴离子,在环中性到酸性条件下与周围水快速交换氧同位素。因此,亚硫酸盐和水之间的平衡氧同位素分馏因子(18α和17α)对于解释硫酸盐的三重氧同位素组成和限制硫循环至关重要。然而,平衡18α值的约束仍然很差,实验和理论估计之间存在显着差异,这主要是由于确定亚硫酸盐氧同位素组成的实验挑战和理论校准的不确定性。此外,平衡17α值以前仅通过理论计算得出。在这项研究中,我们应用了ph转移技术来消除亚硫酸盐沉淀过程中的动力学同位素效应。我们还采用了最近开发的高温还原-排放- co2 /O2同位素交换技术,以最大限度地减少亚硫酸盐吸湿性的影响,并精确测量了亚硫酸盐在pH范围为4.60至8.89,温度范围为12至55°C的情况下与水平衡的三氧同位素组成。我们的研究结果表明,体积亚硫酸盐(包括所有S(IV)-氧阴离子,包括SO32 -和亚硫酸盐异构体(HS)O3 -和SO2(OH) -)与水之间的氧同位素分馏对pH和温度具有一致的单调依赖性。我们将前者归因于溶解亚硫酸盐在ph控制下的形成。根据我们的数据,我们推导出亚硫酸氢盐与水、亚硫酸盐(SO32 -)与水之间的氧同位素平衡分馏因子:1000ln18α亚硫酸氢盐- h2o =(7.06±1.06)× 103/T - 8.80±3.491000ln18α亚硫酸氢盐- h2o =(6.59±1.32)× 103/T - 12.56±4.34。在我们的研究范围内,相关的质量依赖分馏指数(θ = ln17α/ln18α)与温度无关,亚硫酸氢盐的分馏指数为0.5202±0.0003,亚硫酸盐的分馏指数为0.5155±0.0008。这意味着亚硫酸盐和亚硫酸盐的Δ ' 17O值在25°C时分别比环境水(假设参考斜率为0.5305)偏移-0.152‰和- 0.143‰。我们的发现为与微生物硫酸盐还原和黄铁矿氧化相关的同位素分馏提供了新的见解。观察到的非生物好氧黄铁矿风化过程中硫酸盐δ18O特征的pH依赖性变化可能反映了不同亚硫酸盐在不同pH条件下的氧化。此外,在微生物硫酸盐还原过程中观察到的残留硫酸盐和水之间的同位素分馏表明(HS)O3 -优先再氧化为硫酸盐。
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引用次数: 0
Comment on: Evolution of iron formation to ore during Ediacaran to early Paleozoic tectonic stability, by Fuentes et al. (2025) 评:埃迪卡拉纪到早古生代构造稳定时期铁形成到矿石的演化,Fuentes et al. (2025)
IF 4.8 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2026-01-22 DOI: 10.1016/j.epsl.2026.119864
B. Rasmussen , J-W. Zi , J.R. Muhling , I.R. Fletcher
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引用次数: 0
Zircon deformation features reveal sequence of transient high stress, tension and shearing during seismic faulting: A case study from the Ivrea-Verbano Zone, Italy 锆石变形特征揭示了地震断裂过程中瞬态高应力-张拉-剪切序列——以意大利Ivrea-Verbano带为例
IF 4.8 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2026-01-22 DOI: 10.1016/j.epsl.2026.119858
Sandra Piazolo , Antonio Langone
The mechanisms associated with the propagation of fault ruptures remain debated in terms of sequence of events, processes and magnitude of stresses involved. Microstructures of zircon grains located within and in the immediate vicinity of pseudotachylyte veins reveal a sequence of events transient in time and space and allow recognition of different processes during rupture. The dynamic rupture causes, at its propagating tip, a damage zone of several centimetres thickness. In this damage zone, zircon grains exhibit crystal-plastic deformation signatures ranging from crystal lattice bending continuous throughout whole grains, to distinct planar deformation bands and {112} twin lamellae. Presence of planar deformation bands and {112} twin lamellae suggest locally high stresses, based on similar features reported from meteorite impacts. Absence of well-developed subgrains indicate dominance of low temperature plasticity at the rupture tip. Subsequently, those grains with highest dislocation densities undergo in-situ grain fragmentation. The observed correlation of grains with very high dislocation densities and in-situ grain fragmentation suggests that the effective tensile strength of these grains is sufficiently decreased by the high stored elastic energy to cause their fragmentation when subject to tensile stresses in the wake of the propagating rupture tip. Subsequent displacement along connected damage zone fracture surfaces results in pseudotachylytes formation.
Our data shows that dynamic rupture initiation and propagation results in stresses heterogeneously distributed in space, magnitude and sign causing both ductile and brittle deformation. Our study highlights the value of the accessory mineral zircon in deciphering the nature of rupture zone dynamics.
与断层破裂传播相关的机制在事件顺序、过程和所涉及的应力大小方面仍然存在争议。锆石颗粒的微观结构显示了一系列在时间和空间上短暂的事件,并允许识别破裂过程中的不同过程。动态破裂在其传播尖端造成数厘米厚的损伤区。在该损伤带中,锆石颗粒表现出晶体塑性变形特征,从整个颗粒的晶格连续弯曲到明显的平面变形带和{112}孪晶片。平面变形带和{112}孪晶片的存在表明,根据陨石撞击报道的类似特征,局部存在高应力。缺乏发育良好的亚晶表明在断裂尖端以低温塑性为主。随后,位错密度最高的晶粒发生原位破碎。观察到的具有极高位错密度的晶粒与原位晶粒破碎的相关性表明,当在扩展的破裂尖端受到拉伸应力时,这些晶粒的有效抗拉强度因储存的高弹性能而充分降低,从而导致其破碎。随后沿着连接的损伤区裂缝表面进行位移,形成假羟基地层。我们的数据表明,动态破裂的开始和扩展导致应力在空间、大小和符号上的非均匀分布,导致韧性和脆性变形。我们的研究强调了伴生矿物锆石在解释破裂带动力学性质方面的价值。
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引用次数: 0
Reply to the comment on “The influence of cementation on fault stability” 回复“胶结对断层稳定性的影响”评论
IF 4.8 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2026-01-21 DOI: 10.1016/j.epsl.2026.119867
G. Volpe , R. Affinito , L. Calzolari , G. Pozzi , C. Marone , C. Collettini
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引用次数: 0
Geochemical controls on the formation of lithium brines in closed-basins of the Lithium Triangle 锂三角封闭盆地锂盐形成的地球化学控制
IF 4.8 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2026-01-21 DOI: 10.1016/j.epsl.2026.119849
Gordon D.Z. Williams , Julien Barre , Pascale Louvat , Sylvain Bérail , Romain Millot , Avner Vengosh
Sustainable lithium mining is critical to the renewable energy transition. Closed-basin brines are a major source of lithium yet the processes governing lithium enrichment remain poorly understood. In the Lithium Triangle (LT) of South America, hypersaline brines display anomalously high lithium concentrations including at the Salar de Uyuni (SDU) in Bolivia. Using new geochemical and isotopic data from the SDU, Bolivia, we update the accepted conceptual model of evaporative concentration and sequential mineral precipitation based on the formation of calcite, gypsum, and halite. Here we identify ulexite (Na-Ca-borate) precipitation as a previously overlooked but key process in the evaporative evolution of inflow waters that fundamentally alters brine chemistry prior to halite saturation. Additionally, we reveal that surficial brines are largely disconnected from the major lithium inflow, and instead their chemistries are controlled by cyclic halite dissolution-precipitation, leading to the conservative enrichment of solutes like lithium, boron, and magnesium. We suggest that deep brines exploited for lithium extraction are fossil and reflect different stages of evaporation, while modern processes make little contribution to the solute and lithium balance. This new conceptual model revises the classic geochemical pathway and has broad implications for lithium brines and resource sustainability across the LT.
可持续锂开采对可再生能源转型至关重要。闭盆盐水是锂的主要来源,但控制锂富集的过程仍然知之甚少。在南美洲的锂三角(LT),包括玻利维亚的乌尤尼盐湖(SDU)在内的高盐盐水显示出异常高的锂浓度。利用来自玻利维亚SDU的新的地球化学和同位素数据,我们更新了基于方解石、石膏和岩盐形成的蒸发浓度和顺序矿物降水的公认概念模型。在这里,我们确定了无溶解石(na - ca -硼酸盐)沉淀是一个以前被忽视的关键过程,但在流入水的蒸发演化中,它从根本上改变了盐岩饱和之前的卤水化学。此外,我们发现地表盐水与主要的锂流入基本断开,相反,它们的化学成分由循环岩盐溶解-沉淀控制,导致锂、硼和镁等溶质的保守富集。我们认为,用于提取锂的深层盐水是化石的,反映了不同的蒸发阶段,而现代过程对溶质和锂的平衡贡献不大。这个新的概念模型修正了经典的地球化学途径,对整个LT的锂盐和资源可持续性具有广泛的影响。
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引用次数: 0
Inheritance of depleted mantle 186Os signatures in Tibetan ophiolitic chromitites 西藏蛇绿质铬铁矿衰竭地幔1860o特征的遗传
IF 4.8 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2026-01-20 DOI: 10.1016/j.epsl.2026.119855
Yong Xu , Qing Xiong , Bin Qin , Ruohan Gao , Xiaohan Gong , Degao Zhai , D. Graham Pearson , Jingao Liu
The strongly compatible 190Pt-187Re-186, 187Os systematics are relatively resistant to post-magmatic alteration and potentially preserve snapshots of deep mantle processes, making them valuable for tracing the origins of ultramafic-mafic rocks. To compare high-Cr and low-Cr podiform chromitites within ophiolite suites and uncover their formation mechanisms and related mantle evolution, we conducted the first combined high-precision 186Os-187Os and platinum group elemental (PGE: Os, Ir, Ru, Pt, and Pd) investigation of the Luobusa (mean Cr#=78) and Zedang (mean Cr#= 61) ophiolitic chromitites from south Tibet, China. The contrasting 187Os/188Os ratios between the Luobusa high-Cr (0.1271 ± 0.0002) and Zedang low-Cr (0.1292 ± 0.0004) chromitites correlate with their different degrees of fractionation between palladium-group (PPGE) and iridium-group (IPGE) PGE. This relationship follows a global trend and largely reflects the distinct natures of their parental magmas (boninitic vs. MORB-like). Importantly, both chromitites exhibit relatively homogeneous unradiogenic 186Os/188Os ratios (Luobusa: 0.1198359±0.0000026; Zedang: 0.1198355±0.0000005), which are independent of indices of magmatic differentiation such as Cr# and PGE fractionation. These values are comparable, within analytical uncertainties, to the averages of global abyssal peridotites and Phanerozoic Os-rich alloys, and are slightly lower than the primitive mantle and H ordinary chondrites. The 186Os similarity between the Luobusa chromitites and abyssal peridotites is consistent with their known 187Os similarity that features an unradiogenic 187Os/188Os peak at ∼0.126. The combined unradiogenic 186Os-187Os systematics also show no resolvable genetic linkage to plume-related magmatism or recycled crustal materials. Instead, their parental magmas appear to originate from a depleted mantle source.
强相容的190Pt-187Re-186、187Os系统相对不受岩浆后蚀变的影响,并可能保存深部地幔过程的快照,使其对追踪超基性-基性岩石的起源具有价值。为了比较蛇绿岩组中高铬和低铬脚状铬铁矿,揭示其形成机制和相关的地幔演化,我们首次对藏南罗布沙(平均Cr#=78)和泽当(平均Cr#= 61)蛇绿岩铬铁矿进行了高精度186Os-187Os和铂族元素(PGE: Os, Ir, Ru, Pt和Pd)的组合研究。罗布萨高铬(0.1271±0.0002)和泽当低铬(0.1292±0.0004)铬铁矿的187Os/188Os比值差异与钯基(PPGE)和铱基(IPGE)的PGE分馏程度不同有关。这种关系遵循全球趋势,并在很大程度上反映了它们的母岩浆的不同性质(博尼岩型与morb型)。重要的是,两种铬铁矿均表现出相对均匀的非放射性成因的186Os/188Os比值(罗布萨∶0.1198359±0.0000026;泽当∶0.1198355±0.0000005),与Cr#和PGE分选等岩浆分异指标无关。在分析不确定度范围内,这些值与全球深海橄榄岩和显生宙富os合金的平均值相当,略低于原始地幔和H普通球粒陨石。罗布萨铬铁矿与深海橄榄岩之间的186Os相似性与已知的187Os相似性一致,其中187Os/188Os峰值为~ 0.126。1860s - 1870s的非放射性成因系统也显示出与羽状岩浆活动或再循环地壳物质没有可解决的遗传联系。相反,它们的母岩浆似乎来自枯竭的地幔源。
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引用次数: 0
Comment on “The influence of cementation on fault stability” 评“胶结作用对断层稳定性的影响”
IF 4.8 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2026-01-19 DOI: 10.1016/j.epsl.2026.119845
Sylvain Barbot
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引用次数: 0
The beating sound of passive degassing at an open-vent volcano captured by combined infrasonic and SO2 flux observations 利用次声和SO2通量联合观测捕获的露天火山被动脱气的跳动声
IF 4.8 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2026-01-16 DOI: 10.1016/j.epsl.2026.119846
D. Delle Donne , G. Lacanna , A. Aiuppa , M. Bitetto , G. Ulivieri , F. Biagioli , G. Lo Bue Trisciuzzi , M. Ripepe
Volcanic degassing is a key manifestation of volcanic activity, and offers crucial insights into the subtle changes in volcano behavior during unrest and prior to eruption. However, accurately assessing gas emission rates remains difficult, and the implementation of gas flux sensing techniques is one of the most pressing challenges in modern volcanology. Here, we present two years of continuous measurements (April 2017–March 2019) of the SO2 flux and infrasound associated with volcanic degassing at Stromboli volcano (Italy). We show that degassing can be tracked in space and time following changes in infrasonic activity during persistent Strombolian activity. By modeling gas expansion within the conduit, we convert ∼10 million infrasonic signals into equivalent gas fluxes associated with puffing and spattering activity. Our results and calculations from both methodologies indicate a total magmatic gas emission rate ranging between 10 and 100 m³/s. We find this volumetric rate to be almost entirely accounted for by the acoustically-derived gas flux, both in terms of total volume released and the spatial distribution of the degassing sources. Our results open new avenues to interpreting passive degassing at open-vent volcanoes, and demonstrate the potential of infrasound as a valuable tool for quantifying gas emissions in such systems.
火山脱气是火山活动的一个重要表现,它为火山在动荡和喷发前的细微变化提供了重要的见解。然而,准确评估气体排放率仍然很困难,气体通量传感技术的实施是现代火山学中最紧迫的挑战之一。在这里,我们提供了两年(2017年4月至2019年3月)连续测量的SO2通量和次声与斯特隆博利火山(意大利)的火山脱气有关。我们表明,在持续的斯特隆波活动期间,随着次声活动的变化,脱气可以在空间和时间上进行跟踪。通过模拟管道内的气体膨胀,我们将约1000万个次声信号转换为与膨化和飞溅活动相关的等效气体通量。我们的结果和两种方法的计算表明,岩浆气体的总排放速率在10到100 m³/s之间。我们发现,无论从释放的总体积还是从脱气源的空间分布来看,这个体积率几乎完全由声衍生的气体通量来解释。我们的研究结果为解释开放式火山的被动脱气开辟了新的途径,并证明了次声作为量化此类系统中气体排放的有价值工具的潜力。
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引用次数: 0
Discriminating dynamic rupture arrest in fluid-induced microearthquakes using spectral inversion 用谱反演判别流体诱发微地震的动态破裂停止
IF 4.8 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Pub Date : 2026-01-16 DOI: 10.1016/j.epsl.2025.119816
Francesco Mosconi , Elisa Tinti , Mariano Supino , Alice-Agnes Gabriel , Emanuele Casarotti , Men-Andrin Meier , Antonio Pio Rinaldi , Domenico Giardini , Massimo Cocco
Determining the maximum possible magnitude of fluid-induced earthquakes requires to understand rupture arrest within or outside a fluid-pressurized patch. Recent studies have highlighted the importance of incorporating rupture physics into the study of injection-induced earthquakes. We perform 3D dynamic simulations of spontaneous ruptures propagating across a pressurized fault, stimulated by fluid injection within the nucleation zone. Our simulations unveil two end-member models describing a fluid-induced micro-earthquake: a self-arresting rupture that decelerates spontaneously and a run-away rupture that terminates abruptly at the fault edge. We compute synthetic waveforms radiated from both models and invert them using a probabilistic spectral inversion approach to identify characteristics that distinguish between the two rupture types. We find that self-arresting ruptures radiate less high-frequency waves (with γ > 3) and lack the typical P/S corner frequency shift. In contrast, run-away ruptures conform to the ω2 model (γ ∼ 2, fcP/fcS1.3). We interpret these differences as primarily arising from the rupture arrest mechanism, smooth arrest results in gradual variations in the moment-rate function, whereas abrupt arrest at a barrier causes a sharp changes in the moment-rate function. This abrupt arrest generates high-frequency radiation and a back-propagating stopping phase, playing a critical role in controlling the rupture duration and the radiated seismic waves. Our results demonstrate that spectral features such as high-frequency decay and P/S corner frequency shift may provide observational diagnostics to distinguish rupture arrest mechanisms, even in the absence of direct evidence from rupture kinematics.
要确定流体诱发地震的最大可能震级,就需要了解流体加压区内外的断裂抑制。最近的研究强调了将破裂物理学纳入注入诱发地震研究的重要性。通过在成核区内注入流体,我们对沿加压断层传播的自发破裂进行了三维动态模拟。我们的模拟揭示了描述流体诱发微地震的两种端元模型:一种是自发减速的自阻破裂,另一种是在断层边缘突然终止的失控破裂。我们计算了两种模型辐射的合成波形,并使用概率谱反演方法对它们进行了反演,以识别区分两种破裂类型的特征。我们发现自阻破裂辐射较少的高频波(γ >; 3),并且缺乏典型的P/S角频移。相反,失控破裂符合ω2模型(γ ~ 2,fcP/fcS ~ 1.3)。我们将这些差异解释为主要由破裂停止机制引起的,平滑停止导致矩率函数的逐渐变化,而在屏障处突然停止导致矩率函数的急剧变化。这种骤停产生了高频辐射和反向传播的停止相位,对控制破裂持续时间和辐射地震波起着关键作用。我们的研究结果表明,即使在没有破裂运动学的直接证据的情况下,频谱特征(如高频衰减和P/S角频移)也可以提供观察诊断来区分破裂阻止机制。
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引用次数: 0
期刊
Earth and Planetary Science Letters
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