Posts

Mystery Tsunami in Indonesia

Yesterday, following two earthquakes (the second a magnitude 7.5 quake) and a series of aftershocks off the west coast of Sulawesi Island, a tsunami struck Palu, at the end of a long, narrow bay.  Both the Island and the adjacent Makasser Strait lie squarely on a southern extension of the Eurasian Plate, which encompasses all of Indonesia. Destructive tsunami's are generally triggered by Subduction Earthquakes , where one tectonic plate dips beneath another; such a subduction zone stretches along the outer border of Indonesia, where the Australian and Philippine Plates are subducting beneath the Eurasian Plate.  Yesterday's series of quakes and aftershocks are thought to have developed along a transverse fault, where two microplates (of the Eurasian Plate) are scraping past one another; such faults do not generally produce vertical lift of the overlying sea, the tectonic process that usually generates tsunamis. Geologists suspect that some vertical movement of one of the micr...

Praise for Christine Ford

On behalf of all Americans who care about women's rights and equal justice, I want to commend Dr. Christine Blasey Ford for her courage.  Despite her personal fear and anxiety and the threats made to her family, she was willing to appear before the Senate Judiciary Committee to accuse Judge Brett Kavanaugh of sexual assault during their high school years.  Her testimony was calm, credible and, in my opinion, 100% convincing. On his part, Judge Kavanaugh delivered an emotional opening statement but then resorted to dismissive, confrontational and disrespectful behavior when questioned by Senate Democrats.  Repeatedly reminding the Senators and the TV audience of his professional accomplishments and his regular church attendance, the judge surely pleased Trump and his conservative base but likely failed to convince most Independents and Democrats of his innocence.  An innocent individual would not ridicule those entrusted with assessing his fitness for the Supreme Cour...

Pink Egrets at Dusk

Last evening, I went out at dusk to explore our Littleton farm.  Most of the bird sightings were of mallards, great blue herons and ring-billed gulls, heading toward their nightly quarters to our northwest. A squadron of small bats strafed the farm and our colony of cottontails emerged for a leisurely night of nibbling.  Off toward a corner of the property, a noisy flock of magpies had gathered in a tree, apparently heckling a hawk or owl.  Above it all, jets drifted toward DIA and the clouds took on the changing hues of sunset.  Not to be outdone by Earthly events, Jupiter gleamed from the southwest while Saturn sparkled in the southern sky. The highlight of my evening stroll proved to be a flock of pink egrets, fourteen in number, flapping toward a roost somewhere north of the farm; of course, they were snowy egrets, painted by the last rays of the setting sun.  Apparently unfazed by the cooler weather, they will spend at least another day along the Front Rang...

Looking for Migrants

On this chilly, autumn morning, with a full moon balanced on the foothills to our west, I went down to South Platte Park, hoping to encounter fall migrants.  The early morning chill had brought out the songbirds, flitting and twittering among the shrubs and trees, but all was relatively quiet on the lakes and river. During my one hour visit, I did observe two flocks of blue-winged teal, passing overhead, a handful of pied-billed grebes and a pair of Wilson's warblers, down from the mountains.  That was the extent of the autumn migration, a tide that has not yet gained momentum.  I did see plenty of permanent and some summer residents, including an osprey, a great horned owl, gray catbirds, double-crested cormorants and wood ducks, but the migrants have been slow to appear. Nevertheless, it was a pleasant walk around Eaglewatch Lake.  I got my exercise, enjoyed the fresh, cool air and appreciated the company of the resident wildlife.  The migrants will turn up so...

Earwigs in the Apples

On this bright, warm, autumn morning, our youngest grandson visited our Littleton Farm.  Searching for an activity that might entertain him, my wife suggested picking some of our green apples and making cinnamon apple sauce. He, of course, enjoyed the collection process and sampled quite a few of the apples before they were processed.  Since we do not use pesticides on the farm, a good number showed signs of insect damage and earwigs emerged from a few of the cavities.  Represented by about 2000 species across the globe, these elongated, flattened insects are easily identified by the pincers at the end of their abdomen.  Females lay their eggs in protected crevices by mid autumn and, in some species, overwinter with them to offer protection; after hatching in late winter, the juveniles undergo at least four molts before they mature to adults.  Throughout these stages, they feed on a wide variety of plant and animal matter, including flowers, vegetation, fruit, o...

Autumn Chill in the Valley

While the afternoons are still summer-like along the Colorado Front Range, the mornings now bring an autumn chill due to the longer nights.  Down on the South Platte River just after dawn, that chill was especially intense and, in response, the wild residents were noisy and active. Canada geese, mallards, magpies and cedar waxwings were especially conspicuous and migrant ducks were beginning to arrive from the north; this morning's visitors included blue-winged teal, American wigeon and gadwalls.  A few summer residents still remain and a lone snowy egret, huddled on driftwood in the shallows, seemed to be contemplating his escape to warmer climes.  Normally nocturnal, a beaver was active in the post-dawn chill, inspecting his dam before winter arrives. We humans, like the wildlife, are also invigorated by the chilly air and the riverside path was filled with walkers, bikers and joggers.  After all, the fall equinox arrives this weekend (September 22) and the gloriou...

Flooding and Federal Policy

As we witness the tragic flooding from Hurricane Florence along the Southeast Coast, we are reminded of the devastation in Houston caused by Hurricane Harvey and the repeated spring flooding along some American Rivers (the Red River of the Northern Plains comes immediately to mind). Having decided that flood insurance is a money losing proposition, private insurance companies have backed away from such coverage, donating that option to the Federal Government.  As is often the case, the U.S. Government accepted the challenge and is now billions of dollars in the red (even before the devastation caused by Hurricane Florence). One wonders whether Federal dollars would be better spent buying up properties on floodplains and barrier islands and assisting with local engineering efforts rather than encouraging insurance holders to rebuild in those flood-prone areas.  After all, global warming is threatening coastal communities as sea levels rise and will likely intensify the power of...