#Repost from @scienceaddicts with @regram.app ... Gempa dan tsunami mematikan telah menghantam Pulau Sulawesi. Gempa ini disebabkan oleh pergerakan patahan sesar Palu-Koro. Bagaimana bisa pergerakan sesar horizontal menyebabkan tsunami?
Ada beberapa kemungkinan: (1) Tsunami hanya bisa terjadi jika ada pergerakan vertikal yang mengiringi gerakan sesar ini sehingga mampu memindahkan sejumlah massa air yang mengusik permukaan laut pemicu gelombang. (2) Kemungkinan kedua adalah adanya longsoran bawah laut yang memicu terpindahkannya sejumlah massa air yang memicu perubahan muka laut. (3) Kemungkinan lain sebagaimana dalam skema ini adalah bahwa jika gerakan sesar ini terjadi dalam area yang memotong lereng dengan beda kedalaman maka akan dapat memicu pula perubahan muka laut. (Re-explained by @scienceaddicts).
#Repost from @a_geologist with @regram.app ... A deadly earthquake and tsunami struck the island of Sulawesi, Indonesia, today. The earthquake was caused by motion on a large strike-slip fault. How can motion on a strike-slip fault that only has horizontal motion cause a tsunami? For a tsunami to be generated, there needs to be some vertical displacement of the sea surface to start the wave. It’s possible that there was some slight vertical motion on the dominantly horizontal motion of the fault. It’s also possible that a submarine landslide was triggered that displaced water. But, as shown here, yet another possibility is that if the strike slip fault crosses a major change in seafloor depth, that could also cause displacement of the sea surface and start a tsunami.
Photos and images from AP, Google, USGS, White et al. (2014); sketches are by @a_geologist; my dog apologizes for his drop of slobber on the second sketch .
Achei hoje uma rocha que se parece muito um pequeno meteorito. Se alguém souber que tipo de rocha é essa me informe pois suas características muito particulares me deixou intrigado.
Theolitic Basalt from Picture Gorge, Columbia River, USA.
Picture 1) ppl view 4x magnification. Colourless plagioclase with light brown augite and opaque (black) titanomagnetite.
Picture 2) XPL view 4x magnification. Shows very fine groundmass made from labradorite (Ca-rich plagioclase) with microporphyritic orange-light blue/green augite. There are also permanently extinct* microporphyritic titanomagnetite.
Picture 3) XPL 10x magnification shows light blue/green as well as orange augite surrounded by labradorite groundmass permenantly extinct titanomagnetite to the left and slightly to the right.
Picture 4) XPL 20x magnification also shows light blue/green and orange augite surrounded by a labradorite groundmass with a permenantly extinct titanomagnetite in the top right. *Titanomagnetite is permenantly extinct due to being in the Isometric crystal system.
Meet Senior Geologist Chris Fell, CPG! Chris has been with R&M for the past four years. His experience includes 13 years of engineering and environmental geology, environmental investigation and remediation, and GIS modeling. Chris enjoys figuring out the unique problems that each project raises and his current favorite project is the work R&M is doing at the Fairbanks Internal Airport characterizing PFAS contaminants, an emerging environmental contaminant.
Chris almost became a rock climber instead of pursing geology. He describes himself as sarcastic, driven and irreverent. He is currently in the process of building a house, doing most of the work himself with the help of his wife. Chris's two boys love to be involved too and steal the building supplies to build forts in the woods around the site.
With an average elevation of 13,750 ft. and hundreds of volcanic centers, the Puna plateau is truly a one of a kind place on this planet. Grateful, humbled, and extremely happy to call this area a field site for my PhD research. Gracias, Pachamamma for allowing me to study your beauty. I’ll be back, next time without the altitude sickness. #science#punaplateau#argentina#volcano#ceoas#galán#phdlife#geology
If humans started washing up on beaches with stomachs full of plastic immediate action would be taken I think we can all be certain of that.
Yet just becuase it only happens to millions of other marine mammals we don't batter an eye lid. Whales, dolphins, turtles all found dead due to plastic and yet we look the other way. We must take a stance today!
Tag any company below who needs to change their ways for the sake of the planet 🌏