Active fault systems, and what each one is doing

54 systems tracked. 12 are currently above their own background rate.

Every system below has an earthquake rate measured from decades of catalogue history. The point of the pages is the comparison: not "there was a magnitude 4", but "there were four this month where this fault normally produces one".

Afghanistan / Pakistan

• Chaman Fault System
  background · 10067 km mapped, 100 segments

Alaska, USA

• Aleutian Megathrust
  background · 2431 km mapped, 41 segments
• Castle Mountain Fault
  background · 740 km mapped, 224 segments
• Denali Fault System
  background · 2336 km mapped, 223 segments

California, USA

• Calaveras Fault
  unknown · 204 km mapped, 3 segments
• Garlock Fault
  unknown · 375 km mapped, 3 segments
• San Andreas Fault
  background · 1682 km mapped, 14 segments

Chile

• Liquine-Ofqui Fault Zone
  background · 3368 km mapped, 71 segments

Ethiopia

• Main Ethiopian Rift
  background · 3172 km mapped, 54 segments

Ethiopia / Eritrea / Djibouti

• Afar Triple Junction
  background · 3236 km mapped, 30 segments

Germany / Netherlands / Belgium

• Lower Rhine Graben
  unknown · 1375 km mapped, 15 segments

Greece

• Gulf of Corinth Rift
  background · 1541 km mapped, 25 segments
• Hellenic Arc
  elevated · 880 km mapped, 14 segments

Guatemala

• Motagua-Polochic Fault
  background · 6960 km mapped, 60 segments

Himalaya

• Himalayan Main Frontal Thrust
  unknown · 2049 km mapped, 10 segments

Hispaniola

• Septentrional Fault Zone
  background · 2892 km mapped, 11 segments

Hispaniola / Jamaica

• Enriquillo-Plantain Garden Fault
  background · 3949 km mapped, 34 segments

Iceland

• Reykjanes-South Iceland Seismic Zone
  background · 380 km mapped, 15 segments
• Tjornes Fracture Zone
  unknown · 253 km mapped, 7 segments

Indonesia

• Sunda Megathrust
  background · 7698 km mapped, 66 segments

Iran / Iraq

• Zagros Fold-Thrust Belt
  background · 17404 km mapped, 86 segments

Iran / Pakistan

• Makran Thrust Belt
  background · 12434 km mapped, 76 segments

Italy

• Apennine Normal Fault Belt
  background · 3747 km mapped, 27 segments

Japan

• Japan Trench
  background · 917 km mapped, 37 segments
• Median Tectonic Line
  background · 4851 km mapped, 76 segments
• Nankai Trough
  background · 978 km mapped, 21 segments

Kenya / Tanzania

• East African Rift, Eastern Branch
  background · 5275 km mapped, 66 segments

Levant

• Dead Sea Transform
  background · 2618 km mapped, 15 segments

Malawi / Mozambique

• Malawi Rift
  background · 3588 km mapped, 115 segments

Myanmar

• Sagaing Fault
  background · 14502 km mapped, 60 segments

Nevada / California, USA

• Walker Lane Belt
  background · 10448 km mapped, 127 segments

Nevada, USA

• Central Nevada Seismic Belt
  unknown · 1216 km mapped, 11 segments

New Zealand

• Hikurangi Subduction Margin
  background · 715 km mapped, 15 segments

Pacific Northwest, USA / Canada

• Cascadia Subduction Zone
  background · 1204 km mapped, 45 segments

Philippines

• Philippine Fault Zone
  background · 9738 km mapped, 79 segments

Russia

• Kamchatka-Kuril Trench
  rupture · 2493 km mapped, 36 segments

SE Alaska / British Columbia

• Queen Charlotte-Fairweather Fault
  background · 2142 km mapped, 16 segments

San Francisco Bay Area, USA

• Hayward-Rodgers Creek Fault
  unknown · 394 km mapped, 4 segments

Sichuan / Yunnan, China

• Xianshuihe-Xiaojiang Fault
  background · 9738 km mapped, 42 segments

Sichuan, China

• Longmenshan Fault Zone
  background · 1676 km mapped, 11 segments

South America

• Peru-Chile Megathrust
  background · 7769 km mapped, 4 segments

South Island, New Zealand

• Alpine Fault
  background · 1115 km mapped, 6 segments

Southern California, USA

• Elsinore Fault Zone
  unknown · 304 km mapped, 4 segments
• Los Angeles Blind Thrusts
  background · 1439 km mapped, 38 segments
• San Jacinto Fault Zone
  unknown · 278 km mapped, 7 segments

Spain / Morocco

• Betic-Alboran System
  background · 5120 km mapped, 88 segments

Sumatra, Indonesia

• Great Sumatran Fault
  background · 2257 km mapped, 19 segments

Tibet / China

• Altyn Tagh Fault
  background · 5969 km mapped, 30 segments
• Kunlun Fault
  background · 6228 km mapped, 26 segments

Turkiye

• East Anatolian Fault
  background · 6068 km mapped, 49 segments
• North Anatolian Fault
  background · 8406 km mapped, 44 segments

Uganda / DRC / Tanzania

• East African Rift, Western Branch
  background · 6865 km mapped, 89 segments

Utah, USA

• Wasatch Fault Zone
  unknown · 671 km mapped, 6 segments

Venezuela

• Bocono-San Sebastian Fault
  background · 2766 km mapped, 21 segments

What is deliberately not covered

These zones are in the fault map but are not tracked as systems. An unexplained absence reads as "quiet", so the reason is stated instead.

Where the data comes from

Fault geometry: GEM Global Active Faults Database (GEM GAF-DB), GEM Foundation, https://github.com/GEMScienceTools/gem-global-active-faults Licence: CC-BY-SA-4.0. Figures derived from it on these pages are offered under the same licence. Earthquake counts: United States Geological Survey, public domain.