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学术成果 | 深圳大学朱传华副研究员及汪驰升教授在Nature Index期刊GRL发文:单幅InSAR干涉图快速提取高精度同震形变

  • 2026-03-31 19:33:22
学术成果 | 深圳大学朱传华副研究员及汪驰升教授在Nature Index期刊GRL发文:单幅InSAR干涉图快速提取高精度同震形变

近日,深圳大学朱传华副研究员(第一作者)与汪驰升教授(通讯作者)在国际权威地球科学期刊Geophysical Research Letters (GRL)上发表了题为“Holistic Retrieval of Absolute Coseismic Displacement Fields From Single Interferograms via Physics-Aware GANs”的研究论文,研究生甘佳巧和蓝祖琦分别为该论文的第二、第三作者。

GRL是美国地球物理联合会(AGU)旗下的旗舰快报期刊,也是全球公认的地球科学领域顶级期刊之一,是Nature Index(自然指数)首批收录的少数地球与环境科学类核心期刊。

论文信息:

Zhu, C., Gan, J., Lan, Z., & Wang, C.* (2026). Holistic retrieval of absolute coseismic displacement fields from single interferograms via physics-aware GANs. Geophysical Research Letters, 53, e2025GL121419.

https://doi.org/10.1029/2025GL121419

PART.1

研究背景

卫星雷达干涉测量(InSAR)是当前监测地震同震地表位移的核心大地测量手段,具有高空间分辨率、覆盖范围广等不可替代的优势。然而,传统InSAR数据处理流程较为繁琐,通常包括影像配准、空间滤波、多源误差校正(如地形相关误差、轨道误差、大气延迟等),以及最终的相位解缠 。这一串行流程存在的两处瓶颈,使得InSAR形变产品的生成往往滞后于数据获取数小时甚至更久,难以满足震后应急响应对“即时态势感知”的需求:

1. 强烈依赖外部辅助数据

如精密轨道星历、大气模型、GNSS观测等,而这些数据的时空分辨率可能不足或在灾后无法实时获取;

2. 解缠误差与专家经验依赖

断层近场高形变梯度带与低相干区域,相位解缠算法极易产生相位跳变与孤立分割,严重制约了自动化产品的可靠性,往往需要人工介入质量控制。

PART.2

从“逐步纠错”到“端到端提取”

针对上述挑战,该研究提出了一种物理感知生成对抗网络(Physics-Aware GAN),可以实现绝对同震形变的端到端直接提取,简化了复杂的传统数据处理流程,降低了对外部数据的依赖。区别于普通的纯数据驱动模型,该模型在一个基于物理定律构建的庞大合成数据集上进行训练:

1.物理驱动生成

结合Okada弹性半空间位错模型生成真实物理形变。

2.全谱段噪声模拟

全面模拟了大气湍流、轨道斜坡、地形相关的分层延迟以及失相干等噪声。

3.残差引导机制

网络采用多尺度残差引导判别器约束,在区域尺度上消除长波长的轨道和大气误差,同时在局部精准保留近场断裂的清晰边缘。

图1 物理仿真数据集构建和生成对抗网络架构

(a) 物理模型驱动的数据合成流程。输入端InSAR干涉图(红色虚线框所示)是基于Okada模型的形变信号与噪声分量叠加而成;噪声分量包括轨道斜坡、与DEM相关的分层延迟及残差、分形大气湍流、去相关掩膜以及热噪声。(b)生成器架构。采用基于ResNet的编码器-解码器结构。(c)多尺度判别器。三个判别器通过平均池化操作,在递减的分辨率层级上运行。

PART.3

真实地震案例验证

该模型在未经任何微调的情况下,在真实世界的复杂场景中展现出良好的泛化能力和精准度:

1.广泛的地震测试

团队利用18个处于不同构造和观测条件下的真实地震事件对模型进行了验证,与COMET-LiCSAR系统标准解缠产品的对比清晰揭示了本方法的优越性。

2.有效处理失相干区

例如,在2019年Kiblawan地震和2021年Mw 5.6 Lethem地震等低相干场景中,该模型能够推断出空间连续的形变场,显著改善了传统产品中易出现的数据间断和碎片化问题。

3.与GPS观测的高度一致性

以2016年Mw 6.2级Amatrice地震为例,模型反演的绝对位移场与高精度的独立GPS观测结果进行了点对点比对。结果表明,无需任何后处理去趋势,高达69.2%的验证站点结果与GPS测量值在1σ置信区间内达到了统计上的一致!

图2. 物理感知GAN在真实地震案例上的泛化能力

Input:原始的真实含噪InSAR干涉图;Output:生成对抗网络模型提取的绝对位移场;COMET:来自 COMET-LiCSAR 数据库的标准解缠产品(经自适应滤波及SNAPHU方法处理)。

图3. 基于独立GPS观测数据的定量验证(2016年Mw 6.2 意大利Amatrice地震)

(a, c) 分别为降轨和升轨的输入干涉图。(b, d) 背景为由生成对抗网络直接反演得到的绝对视线向位移场。白色箭头表示投影至卫星视线向的GPS测量值,圆圈标记了1σ观测不确定性范围。紫色箭头代表生成对抗网络推断出的同位置位移值,与GPS 1σ一致性数量超69%。

PART.4

潜在应用价值

该研究有效降低了传统InSAR地震形变监测对外部精密轨道星历和大气模型的依赖。在获取到干涉图数据后,基于GPU的单次推断时间不到0.1秒,实现了无需人工干预的地震形变全自动估算,为地震灾后的近实时态势感知提供了可行的技术路径。

本研究的源代码与合成训练数据集已在Zenodo平台开源发布:

https://doi.org/10.5281/zenodo.17982716

供稿 | 汪驰升

编辑 | 李亚楠

审核 | 马   丁

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  1. CONNECT:[ UseTime:0.000484s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000533s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000816s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001606s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000541s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000619s ]
  8. SELECT * FROM `article` WHERE `id` = 519565 LIMIT 1 [ RunTime:0.000397s ]
  9. UPDATE `article` SET `lasttime` = 1777952211 WHERE `id` = 519565 [ RunTime:0.001233s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000299s ]
  11. SELECT * FROM `article` WHERE `id` < 519565 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000390s ]
  12. SELECT * FROM `article` WHERE `id` > 519565 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000782s ]
  13. SELECT * FROM `article` WHERE `id` < 519565 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003265s ]
  14. SELECT * FROM `article` WHERE `id` < 519565 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001759s ]
  15. SELECT * FROM `article` WHERE `id` < 519565 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000892s ]
0.087464s