caa a22 4500 467936161 CHVBK 20180406152958.0 cr unu---uuuuu 170328e20060901xx s 000 0 eng 10.1007/s11069-005-4987-7 doi (NATIONALLICENCE)springer-10.1007/s11069-005-4987-7 The September 8-9, 1998 Rain-Triggered Flood Events at Motozintla, Chiapas, Mexico [Elektronische Daten] [L. Caballero, J. Macías, A. García-Palomo, G. Saucedo, L. Borselli, D. Sarocchi, J. Sánchez] In September 1998 tropical storm "Earl” swept southern Mexico, producing intense rainfall in the states of Oaxaca and Chiapas. Among the most devastated cities was Motozintla, located in the drainage basin of the Allende, La Mina and Xelajú Grande Rivers. The rainfall from the tropical storm totaled 175mm on September 8 and 130mm on September 9, duplicating in two days the average monthly precipitation in the region. Numerous landslides occurred in the vicinity of Motozintla, depositing large volumes of material into the Xelajú Grande stream. Much of this sediment was subsequently remobilized, yielding debris flows, hyperconcentrated flows, and sediment-laden flows that inundated most sections of Motozintla city. The flows covered an approximate area of 3.15km2 with a minimum volume of 4.4 × 106m3 of sediment. Communication of Motozintla with the rest of the Chiapas State was interrupted for about a month, as was the supply of potable water, food, electricity, and fuel. The geologic record around Motozintla indicates that the Xelajú Grande River has been a pathway for similar large floods during the last 6000years. The oldest deposit yielded a radiocarbon age of 5320 ± 100 14Cyears. B.P. At least two historic floods have occurred during the last 100years, a time period defined by a stratigraphically distinct tephra of 1902. Frequency analysis of the historical record of daily rainfall in the Motozintla area suggests that events like that of September, 1998, have a recurrence interval of about 25years. After the catastrophic flows of 1998, the mitigation measures by Municipal Authorities were made without regard to geological and environmental factors, or to taking into consideration the flow magnitude and appropriate hazard-mitigation techniques, with the result that Motozintla remains at serious risk for future floods. Unfortunately, prior to the publication of this study, in early October 2005, Motozintla was seriously damaged again by intense rain provoked by Hurricane Stan. Springer, 2006 Chiapas nationallicence deforestation nationallicence floods nationallicence landslides nationallicence Mexico nationallicence rain-triggered flows nationallicence tropical storm nationallicence Caballero L. Instituto de Geofísica, UNAM Coyoacán, 04510, México, D.F., México aut Macías J. Instituto de Geofísica, UNAM Coyoacán, 04510, México, D.F., México aut García-Palomo A. Departamento de Geología Regional, Instituto de Geologia, UNAM Coyoacán, 04510, México, D.F., México aut Saucedo G. Instituto de Geología, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava No. 5, Zona Universitaria, 78240, San Luis Potosí, México aut Borselli L. Consiglio Nazionale delle Ricerche Istituto di Ricerca per la Protezione Idrogeologica (CNR-IRPI) Unità staccata di Firenze, Piazzale delle Cascine, 15, 50144, Firenze, Italy aut Sarocchi D. Instituto de Geofísica, UNAM Coyoacán, 04510, México, D.F., México aut Sánchez J. CIIEMAD, IPN, México, D.F. aut Natural Hazards Kluwer Academic Publishers 39/1(2006-09-01), 103-126 0921-030X 39:1<103 2006 39 11069 https://doi.org/10.1007/s11069-005-4987-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11069-005-4987-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Caballero L. Instituto de Geofísica, UNAM Coyoacán, 04510, México, D.F., México aut NATIONALLICENCE 700 1- Macías J. Instituto de Geofísica, UNAM Coyoacán, 04510, México, D.F., México aut NATIONALLICENCE 700 1- García-Palomo A. Departamento de Geología Regional, Instituto de Geologia, UNAM Coyoacán, 04510, México, D.F., México aut NATIONALLICENCE 700 1- Saucedo G. Instituto de Geología, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava No. 5, Zona Universitaria, 78240, San Luis Potosí, México aut NATIONALLICENCE 700 1- Borselli L. Consiglio Nazionale delle Ricerche Istituto di Ricerca per la Protezione Idrogeologica (CNR-IRPI) Unità staccata di Firenze, Piazzale delle Cascine, 15, 50144, Firenze, Italy aut NATIONALLICENCE 700 1- Sarocchi D. Instituto de Geofísica, UNAM Coyoacán, 04510, México, D.F., México aut NATIONALLICENCE 700 1- Sánchez J. CIIEMAD, IPN, México, D.F aut NATIONALLICENCE 773 0- Natural Hazards Kluwer Academic Publishers 39/1(2006-09-01), 103-126 0921-030X 39:1<103 2006 39 11069 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer