Elizabeth (Betsy) Madden

Just felt this! #earthquake

October 8, 1963, seismographs register tremors & fissures open on the slopes of Monte Toc. Technicians decide to lower water levels in the #Vajont reservoir, unintentionally destabilizing further the mountain... tinyurl.com/y4yj8n98

The making of our Moon... A new @NASA simulation shows the Moon may have formed much faster than previously thought (over a matter of hours!) following the collision of a Mars-sized object with Earth. Learn more about this lunar origin story: go.nasa.gov/3UYWZ3D

M 4.4 - 16 km ESE of Lacomb, Oregon PAGER - GREEN ShakeMap - IV DYFI? - V Time 2022-10-07 12:52:36 UTC 2022-10-07 12:52:36 UTC at epicenter Location 44.540°N 122.551°W Depth 13.17 km (8.18 mi) ift.tt/UlHX0ZV

.@ShakeOut day is on 10/20. Have you signed up to receive #ShakeAlert-powered alerts on your cell phone? Learn more here: usgs.gov/faqs/how-do-i-… @CAGeoSurvey @CalConservation @USGS_Quakes @Cal_OES @FEMARegion9 @FEMARegion10

UPDATE! - #DidYouKnow the #ShakeAlert seismic network in CA, OR, & WA is now ➡️78% complete? 🎉Our goal is 1,675 stations. See the updated @BerkeleySeismo animation showing the build-out over time. @CAGeoSurvey @Cal_OES @CaltechSeismo @UW @uoregon @waEMD @OregonOEM @PNSN1 @waDNR

Fluids control #earthquakes in subduction zones - but how? We vary pore fluid pressure gradients and model 3D megathrust earthquake dynamics in our🆕paper led by Betsy Madden @TerraNotFirma. We find that fluid pressure is likely very high & controls (1/3) agupubs.onlinelibrary.wiley.com/doi/10.1029/20…

Just published!! The State of Pore Fluid Pressure and 3‐D Megathrust Earthquake Dynamics agupubs.onlinelibrary.wiley.com/doi/10.1029/20…

Same again, not felt nearby. At least we have a sensitive instrument in the house to experience it vicariously through

I just felt this in San Francisco! M3.3 in San Leandro, CA #sanleandro #earthquake

bit.ly/twMeninasCienc… No #DiaInternacionalDasMeninasEMulheresNaCiência destacamos a reportagem "Elas também são cientistas” que mostra como iniciativas que procuram aproximar meninas da ciência se readaptaram na pandemia. #ciência #science #educação #meninasnaciência

Mountains look like they stand stoic and still, but new research reveals that mountains are, in fact, moving all the time, swaying gently from the seismic rhythms coursing through the earth upon which they rest. eos.org/articles/mount…

Observations from Japan on why the far-field tsunami was likely triggered by air-sea coupling, not the standard shallow-water wave propagation from the source. mainichi.jp/english/articl…

Now we are able to issue earthquake alerts, the challenge remains to help people respond and protect themselves. Great review from @DareBaldwin. Don't forget to download @MyShakeApp! theconversation.com/shakealert-ear… via @ConversationUS

free to read link rdcu.be/cE9SN and #OA preprint @EarthArXiv eartharxiv.org/repository/vie…

.. when we evaluate dynamic-rupture-tsunami scenarios against geodetic tsunami observations, synthetics are sensitive to both fault slip at the trench and off-fault plastic deformation. While all scenarios capture the pronounced two-peak characteristic of the first tsunami wave..

We vary the yield strength of near-trench and subducted sediments resulting in distinctly different distributions of near-trench slip, wedge damage and rupture speed but indistinguishable teleseismic and geodetic synthetics, earthquake kinematics & radiation efficiency, but ...

Along-arc variations, specifically in long-term plate convergence rates/loading, too, significantly modulate earthquake evolution, stress drop, thrust vs oblique faulting & slip and lead to spontaneous arrest south of the hypocenter and in the critically lower prestressed North

We use 3D structural models & bathymetry, recordings from seismographs, satellites, corals, acoustic and GPS sensors, long-term plate tectonics, stress inferences, historic events & first-order physics of how rocks break and slide to constrain our earthquake and tsunami models

We model 3D multi-physics dynamic rupture of the 2004 Sumatra #earthquake, one of the largest & longest earthquakes recorded incl. potential splay fault activation, linked to dynamically sourced devastating Indian Ocean #tsunami scenarios using powerful supercomputers @LRZ_DE