Qian Yuan
@qianyuan_geo
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Postdoctoral fellow in geodynamics @Caltech @CaltechSeismo | Earth• Moon•Theia-blobs | Alum @SESEASU | Views my own
Pasadena, CA
Joined February 2019
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First-ever: We've identified a new astronomical object, 'Buried Planet', using SEISMOLOGY, rather than telescopes. It's a survivor of Theia, the planet that collided with Earth 4.5 billion years ago to form our Moon. See our
@Nature
cover paper:
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2K
0. Seismologists long discovered two continent-sized basal mantle anomalies, known as 'large low-velocity provinces,' beneath the Pacific and Africa. Traditionally attributed to Earth's differentiation process. Here we propose they originate from the Moon-forming impactor, Theia.
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This is the whole we have, as shown in this figure: a schematic diagram illustrating the giant-impact origin of the LLVPs.
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If the two mantle blobs are remnants of the ancient impactor planet, could other rocky planets also have a 'buried planet'? Planetary seismology, missions like
@NASAInSight
may help us probe the earliest solar system's history, particularly for Venus which does not have a moon.
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1. We performed state-of-art giant impact simulations, revealing a two-layered mantle structure. The upper layer fully melts, while the lower half remains mostly solid and it surprisingly captures ~10% of the impactor's mantle material, a mass close to current seismic blobs.
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3. We last conducted mantle convection simulations to show that these dense Theia materials can persist atop the core for Earth's entire evolution, ending in two isolated mantle blobs. Their size and calculated seismic velocities align with seismic observations of the two blobs.
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Huge thanks to my collaborators, Mingming Li,
@Deschscoveries
,
@ed_garnero
from
@SESEASU
,
@yoshi_planetes
and Paul Asimow from
@Caltech
, Hongping Deng, Byeongkwan Ko, Travis Gabriel, Jacob Kegerreis, and Vincent Eke. This work is not possible without your contributions!!🙏
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It has been more than 3 weeks, and I still cannot believe I was offered a postdoc fellowship at
@Caltech
!!! Yes, I am going to
@CaltechSeismo
this fall! Still feeling sad to say bye to
@ASU
, to my awesome advisors, colleagues and friends at
@SESEASU
.
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2. Since the bulk Moon has higher Fe content than Earth's mantle, the impactor's mantle may be more iron-rich, making it denser than the background mantle. This extra density could cause the mixture of molten and solid Theia blobs to descend to the core-mantle boundary quickly.
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Delighted to share that my first lead-author paper has been accepted at Nature today as my wife’s birthday and as our baby girl takes her first running steps!! A day of milestones for the whole family! 🎊🎂👨👧👦
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Excited to start my new position today as the O.K. Earl Prize Postdoctoral Fellow at
@CaltechSeismo
@Caltech
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Super thrilled to announce that my first NSF proposal has been funded! 🎉 While I'm in the midst of job interviews, this news boosts my confidence. Immense gratitude to my two mentors for their unwavering support
@Caltech
@CaltechSeismo
. 🙏
#NSF
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#PhDone
This is the moment I’ve been waiting for decades 🎓! What an incredible journey despite two years long
#Covid
! My deepest thanks go to my advisor Mingming Li, all my committees and amazing faculties at
@SESEASU
#ASU
@PhDForum
@PhDVoice
@PhD_Genie
@AcademicChatter
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I prepared a giant-impacted beer of the family of Earth, Theia, Moon and LLSVPs, just waiting for you to taste!!🍻
Planetary Differentiation: Accretion, Evolution, Experiments — Lots of Metal starts
4PM Central Time. See you soon~
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First submitted in 2019, feel like a century ago! Glad it is finally published! My first PhD publication at
@SESEASU
#phdlife
#blobs
#geodynamics
Article: The seismic anomaly beneath Africa is greater in height and less stable than its Pacific counterpart because of its lower density
@qianyuan_geo
@SESEASU
@ASU
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Females, particularly female educators and medical staffs, are the real heroes in the family and society! Today marks a week since the delivery of our first baby, who came out after ~18 hrs-long labor, including failed induction and anesthesia, an infection, fever and C-section!
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I’ve
#3DPrinted
two mantle blobs, which I suggest may originate from the 🌙-forming impactor Theia! 💥Look at the top vertical tube, that is a mantle plume beneath Hawaii 🌋
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How exciting to receive the
#OSPA
certificate three days before my defense😁 thanks
@SEDI_AGU
@KananiKMLee
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What a wonderful morning to find your paper was accepted at
#GRL
@theAGU
! Stay tuned for new dynamics related to the massive
#mantle_blobs
#LLSVPs
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Two decades ago
@LouisMoresi
, Shijie Zhong and colleagues at
@CaltechSeismo
wrote the first community mantle convection code, CITCOM! Great to see their reunion at
#CaltechSeismo100
Cannot say goodbye …
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Huge congrats to
@GeoPlanetKing
for being a AGU Fellow at
#AGU2023
Honors Ceremony! 🌟 Your dedication and expertise in geodynamics are truly inspiring! Congratulations on this well-deserved honor!
#Geodynamics
#ScienceExcellence
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Honored to receive an invitation to give a seminar at the largest high school in the US,
#GranadaHillsCharter
(over 5,000 students)! The questions from the students were absolutely amazing. Hope I can inspire some of them to study Earth and planetary science in future. 🔥🌍
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Our session went well I think, and huge thanks to my awesome colleagues
@rdasgupta_earth
@srin_r5
and we miss you as well
@S_J_Lock
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Being a father is the most challenging and happiest work! ❤️🔥💓💞❤️🩹Celebrate my first
#FathersDay
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The first book we’ll read aloud to our little baby girl! Thanks for sharing your inspiring journey,
@ltelkins
Congratulations 🎉🎊🎈
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Unwrapped the best 2023 gift: 40 heartfelt thank you letters from the High School I visited 3 weeks ago. Being a researcher means igniting curiosity in the next generation! Let's keep the curiosity flame alive! 🔥🔥🔥
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Fortunately to encourage the director of
@NASAJPL
@LaurieofMars
at
#LPSC2023
! Alumni from
@ASU
@SESEASU
who is also affiliated at
@Caltech
.
#Dare_mighty_things
#space
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Cannot believe I accidentally encountered my former department director
@minwadhwa
@SESEASU
in front of
@CaltechSeismo
😄👏✌️ Welcome and Happy Halloween 👻 🎃
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Our
@theAGU
session has been accepted as an Union Session!
@S_J_Lock
@rdasgupta_earth
@srin_r5
If you know anyone’s research or yourself fits our theme ‘early 🌍 & 🌙 ’, please let we know!
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Precious words to my little girl from a phenomenal scientist, woman, and leader!
@ltelkins
Cannot wait her growing up and reading it by herself! 📖
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Curious about the uniqueness of Earth's plate tectonics and how we can find exoplanets similar to Earth? Join my session tomorrow at 10 am! I'm honored to be the chair of several excellent talks about tectonics and interiors.
#LPSC2023
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Thanks
@CaltechSeismo
and
@Caltech
for the support and amazing article! This is a unique place for earth and planetary science, particularly for seismology and super glad the paper was published when I am here!! 🌍 🌙
Groundbreaking research led by Seismo Lab Post-Doc Qian Yuan unveils incredible findings: remnants of an ancient planet discovered deep within Earth! This is a remarkable discovery shedding light on our planet's mysterious origins!
#SeismoLab
#research
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Standing with two of the most amazing female planetary scientists 😎
@minwadhwa
& Sarah Stewart
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Sad to know a
@SESEASU
colleague was hit and robbed yesterday night at 200m close to our department!!!
#StopAsianHateCrimes
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I am truly humbled by the report by Paul
@voooos
#ScienceMagazine
for our recent
#LPSC
presentation! Thanks all for the interest and really appreciate all the valuable comments! Cannot make it without my co-authors
@Deschscoveries
#Mingming_Li
,
#Byeongkwan_Ko
@ASU
@SESEASU
The Earth's mantle may be a planetary graveyard. New work suggests that the guts of the Moon-forming impactor are buried, in the form of continent-sized blobs, in the deep interior. Led by
@qianyuan_geo
and presented at
#lpsc2021
:
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This is it, Centennial Celebration of
@CaltechSeismo
@Caltech
with the theme: Envisioning the future of geophysics!
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Reconnecting with my Earthquake Fellow Program
@CaltechSeismo
coordinator brought back so many unforgettable memories! 🌏 As a mentor to high school students in this incredible program, I’ve witnessed inspiring growth and curiosity!
#AGU23
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Wow, we got 19 abstracts in our
#AGU22
session! I am impressed with my first session as primary conveners! Thanks for the huge support from my amazing co-conveners,
@S_J_Lock
@rdasgupta_earth
@srin_r5
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Started to work at office after 4 weeks off to take care of my baby girl. While I lost 2 pounds, the baby gained 2 pounds!! What a good deal! Win-Win👨👧
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A big day! One step closer to get my PhD! Greatly appreciate the 💪 support I got from all my committee members!! It has been a long and challenging summer, but everything seems on the right track so far. In short, I am back and look forward to the new normal!
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Excited for my jam-packed day tomorrow at
#AGU23
! I’ll be chairing three oral sessions, one enlightening talk and another poster session—all focused on multidisciplinary research to unravel the dynamic and heterogeneous nature of Earth’s interior 🌍
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Received an amazing 🎁 from my incredible committee,
@bosonicpowers
while I finally submitted the revised thesis! Thanks so much and truly grateful for the knowledge and gifts 😄🙏🙏
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Finally get a bit restful weekend after weeks thesis writing ✍️
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Merry Christmas 🎄！Hope we all have a peaceful holiday and splendid 2023!
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Humphreys Peak, the icy peak of AZ~ celebrating the survival of the 2021 spring 🥳
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An excellent overview of our work by
@AnilOza16
from
@Nature
. It was a delightful and inspiring conversation.
a new study by
@qianyuan_geo
makes a "serious case" that large blobs in the mantle are remnants of the collision that created the moon ☄️🌎🌕
“It’s not just a throwaway idea, which is kind of what I think [it] was before this work.”
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Ever wondered why Earth is tectonic unique? Come to my poster 0010 this morning!
#AGU23
Today at 9:30am, Qian Yuan will be presenting "A Giant Impact Origin for the First Subduction on Earth" where they discuss the thermochemical structure of the mantle created by the Moon-forming giant impact that creates a mechanism for the earliest subduction initiation.
#AGU23
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Submitted my first AGU session proposal this week
#AGU22
, about early Earth and the Moon! An ambitious try for Union session, but hope it can be selected. Many thanks for amazing supports from co-conveners,
@S_J_Lock
,
@rdasgupta_earth
and
@srin_r5
. Chicago we are coming! Im, NASA
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Morning New Orleans! Day3
#agu21
Begin to like the normal wetness here! Excited about today’s communication 👏
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Last day for my wife as a math teacher for a local K-8 school. Among so many cute gifts she received, this sentence on the mug really touches the essence of teaching!
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Morning, Sunset Crater! One of the most explosive volcanoes 🌋 ~1000 years ago!!!
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Check out my AGU2020 poster! Giant Impact Origin for the LLSVPs. Listen to the 1-min "Voice of Mantle Convection", inspired by Leif Karlstrom
@VolcanoListener
in Earthbirds seminar held by
@CinTyLee1
. . Best poster for birthday: gifs, movie, music, beer!!!
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On my way to the best workshop (according to colleagues), Interior of the Earth
#GRC
in western Boston! Excited about the week-long morning to evening interactions with my awesome colleagues discussing why 🌎’s evolution is special!
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Hello Pacific! One of the best parts living in Pasadena is you just need 35 minutes to reach the ocean 🌊
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Amazing workshop of
@underworldcode
#3
by
@LouisMoresi
right before tomorrow’s centennial seminar at
@CaltechSeismo
Cannot wait for this milestone event 👏😁
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This is the place I miss the most: Yangshuo, a small town in south China! So many memories come back after being more than 4 years away! Video credit: Phoebe, Omeida
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Ceri Nunn from
@NASAJPL
talk about Farside Seismic Suite at
@CaltechSeismo
! Excited for more lunar interior data!
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I have been knowing you for ~20 years! I am still impressed by you every day! Congrats my ❤️ and I have no doubt you will be a great teacher! Go
@RanShi69351755
@ASU
Make America Math Again!!!
@AndrewYang
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Just had an amazing encounter with my former director
@minwadhwa
at
@SESEASU
and
@AstroDocScott
, the first 👩🚀 I ever shook hands!
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Sharing more commencement photos with awesome faculties
@SESEASU
I met! Many thanks
@davidaw222
for being my hooder, and also really grateful for the unexpected but fabulous graduation gift by
@Deschscoveries
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Back at work in 2024 after a refreshing winter break! Exciting news: one of my projects made it into
@Caltech
's 2023 Year in Review! Big shoutout to my colleagues,
@ZhongwenZhan
@BiondiEttore
@jxli42
@HuskerAllen
, whose work also shined in the list. 🌟
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One of the best sunrises I’ve seen for years! Sierra Nevada, central California!
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My first tweet is NanoSIMS~ after two days tuning, we finally started to measure our sample for Li isotope~ super exciting!!! Thanks
@bosonicpowers
, Ziliang and Tim~
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