Jascha Polet

Seismologist previously known as CPPGeophysics on eX. 
Joined the Great Resignation in Academia.
Two time immigrant, most recently from CA to Italy.
#seismology

Jascha Poletjascha
2026-01-20

Quick map of the M4.9 near Indio, CA, and its current aftershock sequence (with blue outlines). Located about 15 km from the 1992 Joshua Tree quake and consistent with past strike slip faulting in the area.

Quick map of the M4.9 #earthquake near Indio, CA, and its current aftershock sequence (with blue outlines). Located about 15 km from the 1992 Joshua Tree quake and consistent with past strike slip faulting in the area.
Jascha Poletjascha
2025-09-01

Seismicity map of the region of the M6.0 in Afghanistan that occurred yesterday. This event was a shallow reverse event, and has caused many fatalities. Numerous remote villages have been reported to have been heavily damaged, but are difficult to reach.

Jascha Poletjascha
2025-08-10

The M6.1 shallow near Bigadic, Turkey, occurred on a normal fault system, possibly the Sindirgi-Sincanli Fault Zone. A similar event occurred near Simav in 2011 and generated significant damage around the epicenter.

Seismicity map of western Turkey
Jascha Poletjascha
2025-08-06

Update on the sequence in California. Based on the alignment of the events, it now appears that they are occurring on a right lateral strike slip fault aligned with the San Jacinto Fault System. Two other little current sequences: near Lytle Creek to the North & Ontario South.

Seismicity map with earthquakes from past week outlined in blue
Jascha Poletjascha
2025-08-04

A quick map of the of the M8.8 . Aftershocks within the plate (outer rise and deeper intraplate) appear to occur mostly near the large slip patch of the mainshock. More numerous small aftershocks near the epicenter of the mainshock (where the rupture started).

GCMTs of aftershocks plotted on centroid locations with grey outlines and larger symbols. Smaller aftershocks plotted as pink circles. Foreshock sequence in purple. Background seismicity from many different catalogs. Map generated using GMT software by Jascha Polet.
Jascha Poletjascha
2025-07-30

The aftershock zone of today’s M8.8 megathrust is comparable to the rupture area of the 1952 rupture zone from Macinnes et al. (2010). At a rate of 8 cm/year, the accumulated slip of 6 m since 1952 matches with the preliminary rupture model of today’s earthquake.

Jascha Poletjascha
2025-07-30

The first waves from the M8.8 Kamchatka megathrust arriving at the Crescent City CA tide gauge were not the highest, as seen on this plot (this is not uncommon, so do not return to a coast line too quickly!).

Jascha Poletjascha
2025-07-30

Today's M8.8 megathrust on first glance appears similar to the 1952 event in location and size. Today's quake ruptured towards the SW, based on aftershocks (in pink) and preliminary rupture models. The aftershock sequence of the M7.4 foreshock (in purple) of July 20th overlaps with the epicenter of the M8.8 earthquake. The largest amplitude measured by tide gauges was probably 1.7 m (from 0 to peak) at Kahului, Hawaii.

Seismicity mapKahului tide gaugeSeismicity cross section
Jascha Poletjascha
2025-07-15

Interesting M5.8 near the North coast of Greenland just now. A moment tensor has been determined, so it appears this was a real event and not a glitch (high non double couple % though). I wonder if may not have a been a simple tectonic event?
earthquake.usgs.gov/earthquake

Map generated at USGS NEIC website
Jascha Poletjascha
2025-07-05

The fields of sunflowers everywhere are making up for the scorching temperatures

Jascha Poletjascha
2025-07-04

Hating the heat, but enjoying all the plants and butterflies around right now. Here is a swallowtail on lavender, reminding me to plant lots of those in our new backyard.

swallowtail on lavender
Jascha Poletjascha
2025-07-01

An advantage (and probably the only one…) of not being able to sleep because of the incredible heat is watching the sun rise very early in the morning
🌄🌅🇮🇹

Sunrise: mountains with wispy clouds
Jascha Polet boosted:
Phil Plaitbadastro
2025-06-24

I give you a momentary reprieve from the madness:

The Vera Rubin Observatory has taken its first images of the sky, and they are *extraordinary*. Mind blowing detail, jaw dropping beauty.

badastronomy.beehiiv.com/p/rub

Jascha Poletjascha
2025-06-24

Sometimes you just need the sound of bikes and the Italian fans around you to block out the world right now
🏍️🇮🇹

Bikes riding fast in front of the Mugello pit
Jascha Poletjascha
2025-06-17

@serac I enjoyed reading that link, thanks!

Jascha Poletjascha
2025-06-17

When you are driving through the mountains of obviously one of the highlights is …. a 3D printed concrete version of the white tower of Minas Tirith!

a 3D printed concrete version of the white tower of Minas Tirith zoom ina 3D printed concrete version of the white tower of Minas Tirith
Jascha Poletjascha
2025-06-16

New visitor to the !

Little owl on bird feeder
Jascha Poletjascha
2025-06-07

Looking over my photos from the Golden Gala in of I find that the audience reaction is sometimes even more entertaining than the actual achievement involved!

Italian pole vaulter crosses the bar with spectators looking on.
Jascha Poletjascha
2025-06-07

A fun evening at the Golden Gala in watching and taking lots of photos. started his comeback attempt, dominated her race, Italians loudly supported their athletes (and others) and there were some close races!

Different shots of Tamberi in action in his first competition since his injury Chebet feeling very sprightly after easily winning her race shakes the hands of her wiped out competitors Italian spectators supporting the woman pole vaulter from their country Close race finish between two 1500m runners, Habz won
Jascha Poletjascha
2025-05-29

@bud_t yes, yesterday’s stage was amazing to watch!

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