CHIRAKU
Earth science visual simulator
Free · Designed for iPad. Not verified for macOS.
Watch plate tectonics, seismic waves, eruptions and more progress through four phases to a real-world endpoint such as the Mid-Atlantic Ridge or the San Andreas Fault.
CHIRAKU is an interactive educational app for learning the major phenomena of earth science.
Each simulation runs through four discrete phases — initial state, formation, development, and final form — ending at a real-world geological feature or representative observation. This makes it immediately clear what is happening and what the end state looks like, which is essential for classroom and self-study use.
Included simulations:
1. Plate Tectonics
Three types of plate boundaries (divergent, convergent, transform) develop step by step. Each ends at a real-world landform: the Mid-Atlantic Ridge, the Japan Trench and island arc, and the San Andreas Fault.
2. Seismic Waves
P-waves and S-waves radiate from the hypocenter through the crust. Three stations record the arrivals and a seismogram trace builds up at the bottom of the screen.
3. Epicenter Location
The Omori formula turns the P-S time difference into a hypocentral distance. Three circles, one per station, intersect at the epicenter — classic triangulation, visualized.
4. Volcanic Eruption
Magma viscosity and gas content drive four eruption styles in succession: Hawaiian, Strombolian, Vulcanian, and Plinian. Particles, ash, and plumes change accordingly.
5. Lava Flow
A lava channel descends from the crater, meandering down terrain. Cooled segments turn black behind the glowing front. Lower viscosity carries lava farther — observe the runout distance.
6. Earth Interior
Four concentric layers — crust, mantle, outer core, inner core. P-waves penetrate everywhere; S-waves stop at the liquid outer core, creating the shadow zone that proves the outer core is liquid.
7. Geomagnetism
Earth's dipole field, the magnetosphere that deflects the solar wind, and the long-term geomagnetic reversal recorded in the Chibanian-age strata.
Features:
- Four-phase progression with always-visible status header
- Japanese labels on every visual element (plate, mantle, trench, fault, hypocenter, magnetosphere, and more)
- Physics formula sheets (Omori's formula, Green's law, Snell's law, and others)
- Speed slider (0.5x to 3x) and previous/next phase buttons
- Light and dark themes
- Japanese and English supported
- Phone and tablet support
Suitable for science teachers, supplementary classroom use, and independent learners curious about the Earth.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Fuji Bit Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Fuji Bit Inc.
- Size
- 25.3 MB
- Category
- Education
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- Japanese
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 Fuji Bit