# Inge Lehmann

> Danish seismologist who discovered the Earth's inner core (1888-1993)

**Wikidata**: [Q256839](https://www.wikidata.org/wiki/Q256839)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Inge_Lehmann)  
**Source**: https://4ort.xyz/entity/inge-lehmann

## Summary
Inge Lehmann was a Danish seismologist who discovered the Earth's inner core in 1936. Born in 1888, she became the first person to identify the solid inner core of the Earth, revolutionizing geophysics. Her work laid the foundation for modern understanding of Earth's internal structure.

## Biography
- Born: May 13, 1888, in Copenhagen, Denmark
- Nationality: Danish
- Education: Studied at the University of Copenhagen and Newnham College, University of Cambridge
- Known for: Discovering the Earth's inner core through seismic wave analysis
- Employer(s): University of Copenhagen, Royal Society
- Field(s): Seismology, Geophysics

## Contributions
- **Discovery of the Earth's Inner Core (1936)**: Lehmann analyzed seismic waves from earthquakes and identified a sharp boundary at approximately 2,900 kilometers beneath the Earth's surface, confirming the existence of a solid inner core. This breakthrough was published in *Nature* and remains a cornerstone of geophysics.
- **Lehmann Discontinuity**: Named after her, this seismic boundary marks the transition between the outer core and inner core, where P-wave and S-wave velocities increase abruptly.
- **Inge Lehmann Medal**: Established in 1997 to honor contributions to mantle and core research, named in her honor.

## FAQs
**What was Inge Lehmann's most significant discovery?**
Lehmann discovered the Earth's inner core in 1936 by analyzing seismic waves, proving its existence and defining its properties. This finding transformed our understanding of Earth's internal structure.

**Where did Inge Lehmann study?**
She studied at the University of Copenhagen and Newnham College, University of Cambridge, where she earned degrees in mathematics and physics.

**What is the Lehmann Discontinuity?**
The Lehmann Discontinuity is a seismic boundary at about 2,900 kilometers beneath the Earth's surface, where P-wave and S-wave velocities increase sharply, marking the transition between the outer and inner core.

**Who influenced Inge Lehmann's work?**
Her research was influenced by early 20th-century seismologists and the emerging field of geophysics, particularly the work of Emil Wiechert and Beno Gutenberg.

**What awards did Inge Lehmann receive?**
She received the William Bowie Medal, the Tagea Brandt Rejselegat, and honorary doctorates from Columbia University and the University of Copenhagen.

## Why They Matter
Inge Lehmann's discovery of the Earth's inner core was a groundbreaking achievement that reshaped geophysics. Her work provided critical evidence for the existence of a solid inner core, confirming theories about Earth's internal structure. Lehmann's findings laid the groundwork for modern seismology and geodynamics, influencing subsequent research on planetary cores. Her legacy endures through the Lehmann Discontinuity, named in her honor, and the Inge Lehmann Medal, which recognizes outstanding contributions to mantle and core research.

## Notable For
- First scientist to identify the Earth's inner core (1936)
- Named the Lehmann Discontinuity, a key seismic boundary
- Recipient of the William Bowie Medal and Tagea Brandt Rejselegat
- Honorary doctorate from Columbia University and the University of Copenhagen
- Founding member of the Royal Society
- Pioneering work in seismology and geophysics

## Body
### Early Life and Education
Inge Lehmann was born on May 13, 1888, in Copenhagen, Denmark. She studied mathematics and physics at the University of Copenhagen and later at Newnham College, University of Cambridge, where she earned degrees that laid the foundation for her career in seismology.

### Career and Research
Lehmann began her career as a seismologist, working at the University of Copenhagen and later as a member of the Royal Society. Her research focused on seismic wave analysis, particularly the behavior of P-waves and S-waves. In 1936, she published her groundbreaking discovery of the Earth's inner core in *Nature*, identifying a sharp boundary at approximately 2,900 kilometers beneath the Earth's surface. This finding confirmed the existence of a solid inner core and revolutionized geophysics.

### Scientific Contributions
Lehmann's work led to the identification of the Lehmann Discontinuity, a seismic boundary where P-wave and S-wave velocities increase abruptly. This discovery provided critical evidence for Earth's internal structure and influenced subsequent research in seismology and geodynamics. Her findings remain foundational to our understanding of planetary cores.

### Awards and Recognition
Lehmann received numerous awards and honors, including the William Bowie Medal, the Tagea Brandt Rejselegat, and honorary doctorates from Columbia University and the University of Copenhagen. She was also a founding member of the Royal Society, reflecting her significant contributions to the scientific community.

### Legacy
Inge Lehmann's legacy endures through the Lehmann Discontinuity, named in her honor, and the Inge Lehmann Medal, established in 1997 to recognize outstanding contributions to mantle and core research. Her work continues to influence modern seismology and geophysics, ensuring her place as a pioneering figure in Earth sciences.

## References

1. The Biographical Dictionary of Women in Science
2. Inge Lehmann
3. Complete List of Royal Society Fellows 1660-2007
4. Virtual International Authority File
5. [Source](https://collections.royalsociety.org/DServe.exe?dsqIni=Dserve.ini&dsqApp=Archive&dsqDb=Persons&dsqSearch=Code==%27NA5258%27&dsqCmd=Show.tcl)
6. [Source](http://www.physics.ucla.edu/~cwp/articles/bolt.html)
7. Encyclopædia Britannica Online
8. FemBio database
9. Brockhaus Enzyklopädie
10. Dansk Biografisk Leksikon
11. Croatian Encyclopedia
12. Freebase Data Dumps. 2013
13. Quora