A neotectonicgeomorphologic investigation of the prehistoric rock avalanche damming Laguna de Metztitlán (Hidalgo State, eastcentral Mexico)
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2004
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| _version_ | 1876446614560702464 |
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| author | Max Suter |
| author_facet | Max Suter |
| contents | A neotectonicgeomorphologic investigation of the prehistoric rock avalanche damming Laguna de Metztitlán (Hidalgo State, eastcentral Mexico) Max Suter Ciencias de la Tierra east Trans sturzstrom Hidalgo State late Holocene Laguna de Metztitlán (Hidalgo State, east-central Mexico) is a natural lake dammed by anunbreached, large-scale rock avalanche (sturzstrom) deposit (area: 2.5 km²; volume: ~0.6 km³; up to~400 m thick in the valley axis; horizontal runout distance: 2,600 m; vertical fall height: 860 m) thatimpounds the Metztitlán River. The natural outflow of the lake is by seepage, the difference between thelake level and the level of resurgence being ~250 m; this value also corresponds approximately to themaximum thickness of the lake deposits. Based on the earlier extent of the lake beyond the town ofMetztitlán, indicated in the «Relación Geográfica de Metztitlán» (A.D. 1579), the delta progradationrate of the Metztitlán River is estimated at ~30 m/yr. Based on this rate and the maximum extent of thepaleolake, the rock avalanche damming Laguna de Metztitlán must have occurred ~5001,100 yr B.P.There are general observations that support a seismic origin of the rock avalanche.Two regional-scale, late Cenozoic, east-west striking, and south-dipping normal faults at thenortheastern margin of this rock avalanche feature pronounced scarps, up to ~250 m high. These faultshave the same orientation as other normal faults with Quaternary activity farther west in the stress anddeformation province of the Trans-Mexican Volcanic Belt, which is characterized by north-south orientedextension. Thick colluvium layers have been cut off and rotated along the northern fault. The southernfault forms a scarp with a height of 275305 cm where it crosses the debris mound of the rock avalanche,which suggests the occurrence of a surface-rupturing earthquake on this fault in the past 1,100 yr. 2004 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57221307 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.3 Vol.21 |
| format | Artículo científico |
| id | redalyc_57221307 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | A neotectonicgeomorphologic investigation of the prehistoric rock avalanche damming Laguna de Metztitlán (Hidalgo State, eastcentral Mexico) Max Suter Ciencias de la Tierra east Trans sturzstrom Hidalgo State late Holocene A neotectonicgeomorphologic investigation of the prehistoric rock avalanche damming Laguna de Metztitlán (Hidalgo State, eastcentral Mexico) Max Suter Ciencias de la Tierra east Trans sturzstrom Hidalgo State late Holocene Laguna de Metztitlán (Hidalgo State, east-central Mexico) is a natural lake dammed by anunbreached, large-scale rock avalanche (sturzstrom) deposit (area: 2.5 km²; volume: ~0.6 km³; up to~400 m thick in the valley axis; horizontal runout distance: 2,600 m; vertical fall height: 860 m) thatimpounds the Metztitlán River. The natural outflow of the lake is by seepage, the difference between thelake level and the level of resurgence being ~250 m; this value also corresponds approximately to themaximum thickness of the lake deposits. Based on the earlier extent of the lake beyond the town ofMetztitlán, indicated in the «Relación Geográfica de Metztitlán» (A.D. 1579), the delta progradationrate of the Metztitlán River is estimated at ~30 m/yr. Based on this rate and the maximum extent of thepaleolake, the rock avalanche damming Laguna de Metztitlán must have occurred ~5001,100 yr B.P.There are general observations that support a seismic origin of the rock avalanche.Two regional-scale, late Cenozoic, east-west striking, and south-dipping normal faults at thenortheastern margin of this rock avalanche feature pronounced scarps, up to ~250 m high. These faultshave the same orientation as other normal faults with Quaternary activity farther west in the stress anddeformation province of the Trans-Mexican Volcanic Belt, which is characterized by north-south orientedextension. Thick colluvium layers have been cut off and rotated along the northern fault. The southernfault forms a scarp with a height of 275305 cm where it crosses the debris mound of the rock avalanche,which suggests the occurrence of a surface-rupturing earthquake on this fault in the past 1,100 yr. 2004 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57221307 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.3 Vol.21 |
| title | A neotectonicgeomorphologic investigation of the prehistoric rock avalanche damming Laguna de Metztitlán (Hidalgo State, eastcentral Mexico) |
| topic | Ciencias de la Tierra east Trans sturzstrom Hidalgo State late Holocene |
| url | https://www.redalyc.org/articulo.oa?id=57221307 |