Monday, April 29, 2013
Look for the cluster of blue dots at the end of the big lake on the left margin of this map. Those are today's earthquakes at Salton Butte volcano.
Today there has been about 45 small earthquakes at the Salton Buttes volcano, in Southern California. This is a normal thing for this particular volcano, for it is still an active volcano as listed by the USGS. There is magma right below it, with a pipe being at about a mile down, and a magma body 4 to 6 miles down, and about 20 miles long. Most of the volcano is buried under thousands of feet of silt, sand, mud and mudstone. A live fumerole exists in what is called the Mud Pots, the Mud Volcanos or humorously the Mudd Trolls.
I visit this volcano all the time, and even photographed and filmed country singer Brian Shotwell here. The earthquake map is by the USGS, and photos by me.
Monday, April 22, 2013
This image I took with an old Minolta 35 mm film camera, with T-Max film.
I developed the film myself. This is Morongo Valley.
An Early Last Century Exploration of my Local Desert
An Excerpt from a book written near the turn of the last century, almost 100 years ago, Adventures in Scenery by James Needham. I believe it is out of print, but it can be found at University archives.
This is a geologists account of early California. It mentions the proterozoic Gneiss that surrounds my house in Morongo Valley. The typos are from whoever archived or published this old text. Enjoy!
"To the west of Palm Springs is San Gorgonio Pass, discovered in 1853, and hailed as the long looked for pass through the mountains by which a railroad from the east might reach the Pacific Coast. To the north is San Gorgonio Peak, at the east- ern end of the San Bernardino range, and to the south is the majestic Mount San Jacinto. The "pass" is a mountain valley formed by faulting of the rocks of the earth's crust. This break in the crust of the earth is the great San Andreas rift, which extends south and east of San Gorgonio Pass and north and west to and beyond San Francisco. Movement along this rift farther northwest, particularly near San Francisco, caused the earth- quake of April 18, 1906. Many faults or breaks in the crust of the earth occur in this region. The Morongo Valley, which separates the San Bernardino mountain range from the Little San Bernardino range, is a "mountain valley" formed by fault- ing. The fault of this latter valley is crosswise of the original drainage of Little, Big, and Dry Morongo creeks, which enter the valley from the San Bernadino mountains from the north- west. The waters of these creeks sink into the alluvium of the valley and the streams disappear, re-appearing again at the lower side of the valley and then flow over the rock-bottomed gorges to the Colorado Desert. The walls of Morongo Canyon are about 300 feet high and are nearly vertical. The rock walls are com- posed of granitic gneiss beautifully laminated and very much distorted, twisted, and folded. The broad plain between "White- water River and Morongo Canyon is known as Conchilla Desert. It is thickly covered with many varieties of cactus, especially the large picturesque barrel cactus, and for this reason it has been labeled the Devil's Garden! Probably more cactuses, or more species of cactus, are observable here than anywhere else on the Colorado Desert. A Joshua Tree National Monument has been established in the Morongo Valley. It is worthy of note that a movement is on foot to establish a Joshua Tree park"
Wednesday, April 17, 2013
Image: Pipes Canyon Intrusion (lava making the surface) of Basalt near Landers. Image by C Liechtenstein.
The Mojave Young Volcano System, and the hot magma below, is live and well in my opinion. Of course, we still do not know for sure. But is the local young volcanos within the ECSZ linked to the extension of the Great Basin region, which includes much of the Mojave Desert? Is this a rifting zone? Indeed it's a region of land pulling apart, as far as geologists usually agree.
Here's a cool and fetching note from a paper written by a geologist about the area I live in, and about a young volcano I live close to. This from the paper: "searching for the pliocene: field trip guide to the southern exposures":
:86.9 (1.6) Continue past New Dixie Mine Road. Ruby Mountain to the right (west) may be one of the vents for local basalt flows. It is an alkaline basalt (basanite) intrusion and flow complex of late Miocene age (6-10 Ma) (Neville, 1986). The local termination of alkaline basalt volcanism near the San Bernardino Mountains appears to coincide with estimates of the beginning of transpres- sional tectonics for the region (Sadler and Reeder, 1983). Basalt from this source can be recognized by entrained megacrysts formed in the mantle of the chrome- diopside group, including kaersutite (Wilshire and Shervais, 1975)."