Earth Diary
Humanity's living memory
Sunday, July 26, 2026

M 5.8 - 99 km SE of Atka, Alaska

A day defined by nature and space: M 5.8 - 99 km SE of Atka, Alaska; Astronomy Picture of the Day: Simulation TNG50: A Galaxy Cluster Forms; M 5.3 - 25 km NW of Kupang, Indonesia.

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  1. 01
    M 5.8 - 99 km SE of Atka, Alaska
  2. 02
    M 5.3 - 25 km NW of Kupang, Indonesia
  3. 03
    Astronomy Picture of the Day: Simulation TNG50: A Galaxy Cluster Forms
  4. 04
    M 5.4 - northern Mid-Atlantic Ridge
  5. 05
    M 5.1 - Tristan da Cunha region
The natural world

What Earth did on its own.

Space

Astronomy Picture of the Day: Simulation TNG50: A Galaxy Cluster Forms

How do clusters of galaxies form? Since our universe moves too slowly to watch, faster-moving computer simulations are created to help find out. One famous effort is TNG50 from IllustrisTNG, an upgrade of the famous Illustris Simulation. The first part of the featured video tracks cosmic gas (mostly hydrogen) as it evolves into galaxies and galaxy clusters from the early universe to today, with brighter colors marking faster moving gas. As the universe matures, gas falls i

EstimatedLive sourceSignificance 30NASA
Nature·Tristan da Cunha region

M 5.1 - Tristan da Cunha region

Magnitude 5.1 earthquake — Tristan da Cunha region. Instrumentally measured by the USGS ANSS network.

EstimatedLive sourceSignificance 20USGS
Nature·18 km ESE of Monterrey, Colombia

M 4.7 - 18 km ESE of Monterrey, Colombia

Magnitude 4.7 earthquake — 18 km ESE of Monterrey, Colombia. Instrumentally measured by the USGS ANSS network.

EstimatedLive sourceSignificance 13USGS
Nature·99 km SE of Atka, Alaska

M 5.8 - 99 km SE of Atka, Alaska

Magnitude 5.8 earthquake — 99 km SE of Atka, Alaska. Instrumentally measured by the USGS ANSS network.

EstimatedLive sourceSignificance 32USGS
Nature·68 km SSW of Masachapa, Nicaragua

M 4.6 - 68 km SSW of Masachapa, Nicaragua

Magnitude 4.6 earthquake — 68 km SSW of Masachapa, Nicaragua. Instrumentally measured by the USGS ANSS network.

EstimatedLive sourceSignificance 11USGS
Nature·25 km NW of Kupang, Indonesia

M 5.3 - 25 km NW of Kupang, Indonesia

Magnitude 5.3 earthquake — 25 km NW of Kupang, Indonesia. Instrumentally measured by the USGS ANSS network.

EstimatedLive sourceSignificance 26USGS
Nature·15 km ESE of Pinglin, Taiwan

M 4.7 - 15 km ESE of Pinglin, Taiwan

Magnitude 4.7 earthquake — 15 km ESE of Pinglin, Taiwan. Instrumentally measured by the USGS ANSS network.

EstimatedLive sourceSignificance 19USGS
Nature·53 km N of Arauco, Argentina

M 4.5 - 53 km N of Arauco, Argentina

Magnitude 4.5 earthquake — 53 km N of Arauco, Argentina. Instrumentally measured by the USGS ANSS network.

EstimatedLive sourceSignificance 9USGS
Nature·south of the Fiji Islands

M 4.6 - south of the Fiji Islands

Magnitude 4.6 earthquake — south of the Fiji Islands. Instrumentally measured by the USGS ANSS network.

EstimatedLive sourceSignificance 11USGS
Nature·northern Mid-Atlantic Ridge

M 5.4 - northern Mid-Atlantic Ridge

Magnitude 5.4 earthquake — northern Mid-Atlantic Ridge. Instrumentally measured by the USGS ANSS network.

EstimatedLive sourceSignificance 25USGS