一个发生在沉积盖层里的破坏性地震:2010年1月31日四川遂宁-重庆潼南地震
摘要
一般而言只有结晶基底才有足够的强度积累大量的应变能然后突然释放形成破坏性地震,而沉积盖层则由于富含孔隙、流体因此较软弱而不能积累足够的能量形成大的地震.而2010年1月31日在遂宁-潼南交界处一次M5.0破坏性地震,多数台站记录短周期面波(Rg)发育,显示出浅震的特征.通过拟合短周期面波和较长周期面波的相对幅度,拟合远震深度震相pP,sP波形,确定该地震深度约为(2±1.5)km,因此该地震发生在厚达6km的沉积盖层之内.虽然文献中有古生代沉积岩中发生4级地震的报道,但是中生代沉积盖层中发生高达5级地震的案例尚无报道.此次地震给破坏性地震的孕育机理研究提供了罕见的案例.
引文
1张国民,汪素云,李丽,等.中国大陆地震震源深度及其构造含义.科学通报,2002,47:663?668
2Klose C D,Seeber L.Shallow seismicity in stable continental regions.Seism Res Lett,2007,7:554?562
3Langston C.Depth of faulting during the1968Meckering,Australia,earthquake sequence determined from waveform analysis of local seismograms.J Geophys Res,1987,92:561?574
4Ma S,Atkinso M G.Focal Depths for Small to Moderate Earthquakes(MN>=2.8)in Western Quebec,Southern Ontario,and Northern New York.Bull Seism Soc Amer,2006,96:609?623
5Kim Y W,Dineva S,Ma S,et al.The4August2004,Lake Ontario,Earthquake.Seism Res Lett,2006,77:65?73
6罗艳,倪四道,郑勇,等.汶川地震余震区东北端一个余震序列的地震学研究.中国科学:地球科学,2010,40:677?687
7Horton S P,Kim W Y,Mitch W.The6June2003Bardwell,Kentucky,Earthquake Sequence:Evidence for a Locally Perturbed Stress Field in the Mississippi Embayment.Bull Seism Soc Amer,2005,95:431?445
8Mori J.Estimates of velocity structure and source depth using multiple P waves from aftershocks of the1987Elmore Ranch and Supersti-tion Hills,California,earthquakes.Bull Seism Soc Amer,1991,81:508?523
9Kafka A L.Rg as depth discriminant for earthquakes and explosion:A case study in New England.Bull Seism Soc Amer,1990,80:373?394
10四川省地质矿产局.四川省区域地质志.北京:地质出版社,1991.7?263
11四川油气区编写组.四川油气区地质志.北京:石油工业出版社,1989.28?74
12孙玮,刘树根,秦川,等.川中磨溪与龙女寺雷口坡组构造特征及油气成藏差异性.成都理工大学学报(自然科学版),2009,36:654?661
13Saikia C K,Kafka A L,Gnewuch S C,et al.Shear velocity and intrinsic Q structure of the shallow crust in southeastern New England from Rg wave dispersion.J Geophys Res,1990,95:8527?8541
14Gupta I N,Brunetti J A,Wagner R A,et al.Discrimination Between Quarry Blasts,Nuclear Explosions and Earthquakes.Rep.TGAL-TR-84-1,Technical Report on Contract F08606-84-C-0009,Teledyne-Geotech,Alexandria,Va.1984
15Bennett T J,Barker B W,McLaughlin K L,et al.Regional Discrimination of Quarry Blasts,Earthquakes and Underground Nuclear Ex-plosions.S-CUBED Report,Contract F19628-87-C-0093,AFGL Tech Rep,TR-89-0114.1989
16Bath M.Sort-period Rayleigh waves from near-surface events.Phys Earth Planet Inter,1975,10:369?376
17Saikia C K.Numerical Study of Quarry Generated Rg as a Discriminant for Earthquakes and Explosions:Modeling of Rg in Southwestern New England.J Geophys Res,1992,97:11057?11072
18万柯松,倪四道,赵里.龙门山周边地区地震波速度结构的有限频率反演.国际地震动态,2010,6:16
19Dawson J,Cummins P,Tregoning P,et al.Shallow intraplate earthquakes in Western Australia observed by Interferometric Synthetic Aperture Radar,J Geophys Res,2008,113:B11408,doi:10.1029/2008JB005807
20Engdahl E R,Hilst R V D,Buland R.Global teleseismic earthquake relocation with improved travel times and procedures for depth de-termination.Bull Seism Soc Amer,1998,88:722?743
21秦启荣,苏培东,李东,等.川中低缓构造成因.新疆石油地质,2005,26:108?111
22汪泽成,赵文智,张林,等.四川盆地构造层序与天然气勘探.北京:地质出版社,2002
23Gupta,H K,Sarma S V S,Harinarayana T,et al.Fluids below the hypocentral region of Latur Earthquake,India:Geophysical indicators.Geophys Res Lett,1996,23:1569?1572
24Rogers A M,Malkiel A.A study of earthquakes in the Permian Basin of Texas-New Mexico.Bull Seism Soc Amer,1979,69:843?865
2Klose C D,Seeber L.Shallow seismicity in stable continental regions.Seism Res Lett,2007,7:554?562
3Langston C.Depth of faulting during the1968Meckering,Australia,earthquake sequence determined from waveform analysis of local seismograms.J Geophys Res,1987,92:561?574
4Ma S,Atkinso M G.Focal Depths for Small to Moderate Earthquakes(MN>=2.8)in Western Quebec,Southern Ontario,and Northern New York.Bull Seism Soc Amer,2006,96:609?623
5Kim Y W,Dineva S,Ma S,et al.The4August2004,Lake Ontario,Earthquake.Seism Res Lett,2006,77:65?73
6罗艳,倪四道,郑勇,等.汶川地震余震区东北端一个余震序列的地震学研究.中国科学:地球科学,2010,40:677?687
7Horton S P,Kim W Y,Mitch W.The6June2003Bardwell,Kentucky,Earthquake Sequence:Evidence for a Locally Perturbed Stress Field in the Mississippi Embayment.Bull Seism Soc Amer,2005,95:431?445
8Mori J.Estimates of velocity structure and source depth using multiple P waves from aftershocks of the1987Elmore Ranch and Supersti-tion Hills,California,earthquakes.Bull Seism Soc Amer,1991,81:508?523
9Kafka A L.Rg as depth discriminant for earthquakes and explosion:A case study in New England.Bull Seism Soc Amer,1990,80:373?394
10四川省地质矿产局.四川省区域地质志.北京:地质出版社,1991.7?263
11四川油气区编写组.四川油气区地质志.北京:石油工业出版社,1989.28?74
12孙玮,刘树根,秦川,等.川中磨溪与龙女寺雷口坡组构造特征及油气成藏差异性.成都理工大学学报(自然科学版),2009,36:654?661
13Saikia C K,Kafka A L,Gnewuch S C,et al.Shear velocity and intrinsic Q structure of the shallow crust in southeastern New England from Rg wave dispersion.J Geophys Res,1990,95:8527?8541
14Gupta I N,Brunetti J A,Wagner R A,et al.Discrimination Between Quarry Blasts,Nuclear Explosions and Earthquakes.Rep.TGAL-TR-84-1,Technical Report on Contract F08606-84-C-0009,Teledyne-Geotech,Alexandria,Va.1984
15Bennett T J,Barker B W,McLaughlin K L,et al.Regional Discrimination of Quarry Blasts,Earthquakes and Underground Nuclear Ex-plosions.S-CUBED Report,Contract F19628-87-C-0093,AFGL Tech Rep,TR-89-0114.1989
16Bath M.Sort-period Rayleigh waves from near-surface events.Phys Earth Planet Inter,1975,10:369?376
17Saikia C K.Numerical Study of Quarry Generated Rg as a Discriminant for Earthquakes and Explosions:Modeling of Rg in Southwestern New England.J Geophys Res,1992,97:11057?11072
18万柯松,倪四道,赵里.龙门山周边地区地震波速度结构的有限频率反演.国际地震动态,2010,6:16
19Dawson J,Cummins P,Tregoning P,et al.Shallow intraplate earthquakes in Western Australia observed by Interferometric Synthetic Aperture Radar,J Geophys Res,2008,113:B11408,doi:10.1029/2008JB005807
20Engdahl E R,Hilst R V D,Buland R.Global teleseismic earthquake relocation with improved travel times and procedures for depth de-termination.Bull Seism Soc Amer,1998,88:722?743
21秦启荣,苏培东,李东,等.川中低缓构造成因.新疆石油地质,2005,26:108?111
22汪泽成,赵文智,张林,等.四川盆地构造层序与天然气勘探.北京:地质出版社,2002
23Gupta,H K,Sarma S V S,Harinarayana T,et al.Fluids below the hypocentral region of Latur Earthquake,India:Geophysical indicators.Geophys Res Lett,1996,23:1569?1572
24Rogers A M,Malkiel A.A study of earthquakes in the Permian Basin of Texas-New Mexico.Bull Seism Soc Amer,1979,69:843?865
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心