small Volcano or geysers are born in Mexicali Baja C?

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Mexicali-BC April 8 of 2010 (Cicese-Morning call Venegas):


Mexicali epicenter
In the later days to the earthquake of 7. 2 degrees in the scale of Richter that registered Sunday 4 of April throughout the Cucapah Mountain range, and that felt widely in the main cities of the north of Baja California and to the south of the United States, the brigades of the Division of Sciences of the Earth they are working in the Valley of Mexicali, including the zone where small sand volcanos are being reported that has formed throughout fractures and springs of water with sulfurous scent and reddish color, some of confused them with geysers.

On the matter, the Dr. Thin Luis Argote, director of the Division of Sciences of the Earth, explained that these manifestations must to the liquefaction phenomenon, that is to say, solid particles or sediments are transported as if they were liquid by the effect of the air or water that happens through the interstices or the communication of pores. The geyser, said, is a term that is applied to an atmosphere where there is volcanic activity, which does not apply in this particular case because the energy involved in the phenomenon is by non thermal movement and.

The presence of small sand volcanos, of an average meter and of diameter or minors, aligned throughout the zones where there have been breaking, is manifestations that appear commonly in sedimentary lands where the main component is sands, the slime and clays, that are not compacted or litificados. During a seismic event there are phenomena of compression and extension; when there is compression the pores between the sediments must expel the air or water that contains in vertical sense and directs or canalizes throughout fractures, at the end of the surface which we are going to observe are these volcancitos of sand.

About the reports of water with sulfurous scent and reddish color, it indicated that they are in the hope of data of field and on the chemical composition of the water, although of way they are interpreting preliminary it like an event of liquefaction produced in clay materials rich and combined with rich sulphur waters. “It is happening something similar to the small volcanos that are forming throughout fractures, but in this case which produces the liquefaction phenomenon no longer is air but water and, like is happening closely together of the epicenter zone, relatively near the geothermal Dark Hill field, where the sulfur content is greater and the sediments are rich in clay (material very fine that when they are combined with the water give that reddish color)”, detailed doctor Delgado Argote.

It indicated that although until the moment the water is not considered dangerous, to have losses sulphur concentrations, it is not potable water and he is not advisable to put in her.

As far as the presence of retorts, it indicated that these will occur of continuous way and will be lowering of magnitude that dates to it have been from minors to 2,5 degrees to 4 and which at the moment they are more frequent to the north of the border, although there is some important in ejido Victory, more near the epicenter.

It detailed that with the earthquake of Sunday 4 of the April, greatest than it has been registered in the instrumental history of the seismic of Baja California, entered activity a region where a seismic activity had been had loss, although structures of faults exist that have mapped years in the last. Historically, it said, the seismic activity throughout the Cucapah Mountain range is until certain unexpected point. Also it considered the magnitude of the event, because the unique report that was had of an earthquake of similar magnitude was at the end of the century ancestor, in 1890 important.
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[link to www.eluniversal.com.mx]
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Ramiro investigator Rodriguez Castle, into the Institute of Geophysical of the UNAM, informed that more than 100 craters than they formed after the earthquake of 7,2 degrees in Mexicali, are product of the liquefaction and nongeysers as he thought.

In an official notice of the Independent National University of Mexico (UNAM), the expert of the Department of Natural Resources in Baja California explained that phenomenon takes place when there is intense a telluric movement with strong accelerations in a zone where great water saturation exists in the sediments.

Guest by the scientific committee that analyzed the affected zones, Rodriguez Castle concluded that during the tremor the movement of particles of the subsoil is liquefied with the water of the sediments, which besides giving name to the phenomenon, exerts pressure that derives in the crater formation similar to anthills.

The investigator exposed that they were hundreds of these formation, arisen from almost simultaneous way to the happened earthquake Sunday 4 of April in Mexicali, those that generated floods in houses of great part of the southern communities of the State Capital.

He abounded that in spite of the size of the formation, that they do not exceed 1,50 meters of radio and one height superior to the 30 centimeters, the ground softened and following the material of the constructions, reported collapses among 20 centimeters and a meter of depth.

Rodriguez Castle assured that by the materials of which they were done, some houses of adobe were colapsaron whereas others only registered collapses.

Also it presented that because the small craters were developed throughout 30 or 40 meters, was given rise to a “interesting and little common geologic phenomenon” that it has been registered previously in Japan and the United States.

It added that after realising a diagnosis of the zone, the scientific committee issued two technical rulings that allowed the government of the state to make decisions to confront the crisis by a natural disaster.

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Last Edited by fërú. on 04/26/2010 01:49 AM