SEISMIC: Living World

The ground under your boots is alive.

SEISMIC adds real structural collapse, earthquakes you can see coming and a body-temperature system to survival. Dig a mine without props and it caves in. Ignore the seismograph and the next quake might bring your house down with it.

Everything is built from scratch, with no dependencies.

What you get

• Structural collapse – every block has a load span. Unsupported blocks creak, shed dust for about a second and then fall as real falling blocks
• Earthquakes with a real magnitude distribution, foreshocks, camera shake, cracking masonry, shattering glass and fissures from magnitude 6 up
• Working seismograph that draws the quake on paper and outputs a redstone signal you can wire to alarms or blast doors
• Geo-Scanner – shows weak blocks from green to red, reads temperatures and forecasts the next quake
• Body temperature driven by biome, altitude, weather, caves and nearby fire or ice, with hypothermia and heat stroke
• Timber Props to brace your mines, and a Thermos for hot tea or a cold drink
• Built to stay light: nothing scans the world. Gamerules, config and commands for servers

Versions and loaders

• NeoForge – Minecraft 1.21.1
• Install on both client and server

✅ You can use this mod in your modpacks.

The full guide

🏗️ Structural Integrity

Every full block has a load span: how far it can reach from solid support before it fails.

When a block loses its support, it creaks and sheds dust for about a second before it gives way. That window is yours: get clear, or brace it with a Timber Prop and save the structure. If you don’t, it comes down as real falling blocks that damage whatever they land on, and stone lands as cobblestone rubble. Pull the middle pillar out of a bridge and the whole unsupported span goes with it.

Mines need props, bridges need columns and glass roofs need frames. Build smart, partner.

🌎 Earthquakes

• Magnitudes follow a real Gutenberg–Richter distribution: frequent small tremors, rare major events.
• Foreshocks come before the main shock and can be detected with instruments.
• During a quake: camera shake, a deep rolling rumble, players thrown off balance, masonry cracking, glass shattering, and weakened load spans near the epicenter, so marginal overhangs finally give way.
• Earthquakes of magnitude 6 and above tear open fissures in natural ground.

📈 Seismograph

A drum seismograph that records ground motion live on paper. Load it with paper (one sheet records a full in-game day) and it will:

• Draw foreshocks and quakes on its rotating drum
• Emit a redstone signal from 1 to 15 from the first foreshock onward (comparator-compatible), ready to drive alarms, blast doors or evacuation systems
• Light its warning lamp and sound an alarm once the reading reaches 4

📡 Geo-Scanner

A handheld instrument with three modes:

• Use on a block: structural sweep of a 13×13×13 area, with every unsupported block outlined from green (sound) to red (critical)
• Use in the air: thermometer showing body temperature, air temperature and felt temperature
• Sneak + use: seismic forecast with estimated magnitude, time to impact and direction of the epicenter

256 durability, repairable with copper ingots.

🌡️ Body Temperature

Your core temperature responds to the biome, altitude, time of day, rain, water, caves (cool and stable, warmer with depth) and nearby heat or cold sources: fire, lava, furnaces, campfires, ice and snow.

• Leather insulates against cold, while heavy metal armor traps heat in hot climates.
• 35 °C mild hypothermia · 33 °C severe hypothermia · 38.5 °C heat exhaustion · 40 °C heat stroke
• A compact thermometer next to the hotbar shows your temperature and which way it is trending.

🥤 Thermos

Fill it at any water source, then hold it to a lit campfire to brew hot tea (grants Warmth) or to ice or snow to chill it (grants Cooling). Each fill holds four servings.

⚙️ Server and Performance

• Built to stay light: nothing ever scans the world. Checks run only where a block actually changed, on a configurable per-tick budget, and never load chunks.
• Gamerules: doEarthquakes, doStructuralCollapse, doBodyTemperature
• Config: span multiplier, checks per tick, quake frequency and maximum magnitude, fissure threshold, warning time, temperature rate
• Commands (operator):
  • /seismic quake <magnitude> [epicenter] [delaySeconds]
  • /seismic stop
  • /seismic forecast
  • /seismic stress <pos>
  • /seismic settle <from> <to>: re-checks builds placed by commands or WorldEdit
  • /seismic temperature <player> [value]
• Safe by design: blocks with block entities (chests, furnaces, machines) never collapse, so no one loses their inventory. Leaves, logs, bedrock and portal frames are exempt as well, and the list can be extended through the seismic:ignores_physics block tag.

🔨 Recipes

• Geo-Scanner: amethyst shard, copper ingots, redstone, glass pane
• Seismograph: iron ingots, paper, redstone, clock, smooth stone
• Timber Prop ×6: three logs stacked vertically
• Thermos: leather, iron ingots, glass bottle

Requirements: Minecraft 1.21.1 · NeoForge 21.1 or newer · install on both client and server

Languages: English, Spanish

Y’all stay safe down in those mines.

More mods by me

If you like this one, you might like these too. All made from scratch.

• MEGATON: Nuclear Warfare – 114 nukes, real craters, tsunamis and fallout
• SKY ACES – 30+ flyable jets, warbirds, helicopters and warships
• SCP: Secure & Craft – survival horror in abandoned Foundation sites
• Hearthstead: Biome Villages – vanilla villages rebuilt as real towns in 8 biomes
• Combat Juice – hit markers, damage numbers and a kill feed (client-side)
• LIVING TEXTURES HD – every mob reborn in HD (client-side)
• Shadowstep: Stealth & Mob Senses – stealth with mobs that see, hear and smell
• Samurai Dynasty – feudal Japan RPG with katanas, parkour and yokai

Found a bug or have an idea? Leave a comment, I read all of them.