Table 3.

Summary of observations made from Quaternary faults in eastern Indonesia, with hypothetical earthquake magnitudes, styles and tsunami risk

FaultTypical segment length (km)Maximum observed total length (km)Step-over/relay width (km)Potential rupture length (km)*Attributable seismicityNotable historical eventsSmf rangeVf rangeTectonic activity classPotential earthquake magnitudePotential earthquake styleAssociated tsunami?
Malino boundary25–751301.2130Y1.05–1.660.22–1.01Maximal to slow7.6NormalY
Gorontalo3095735N1.83–2.360.88–1.69Slow to minimal6.9Strike-slipY
Palu–Koro10–35220<1135YMw7.7, 19961.08–2.300.24–0.89Maximal to slow7.6Strike-slipY
Parigi boundary10–4595380Y1.32–3.250.50–1.45Minimal7.3NormalY
Sapu valley5–2075? <275N1.08–1.450.40Maximal to moderate7.3Strike-slipN
Balantak5425010 (offshore)54Y1.04–1.220.25–0.47Maximal to moderate7.1Strike-slipY
Matano10–60195690YMw 6.1, 20111.02–1.90.23–0.78Maximal to slow7.4Strike-slipY (lake)
Lawanopo and Kendari10–45200770?Mw 7.5, 2001?1.21–1.750.55–0.83Moderate to slow7.2Strike-slipN
Towuti bounding25–5555<155N1.03–2.040.41–1.22Maximal to slow7.1NormalY (lake)
Kolaka5–451751050Y1.05–1.640.23–1.68Maximal to slow7.0Strike-slipY
Mangole201352135Y1.12–1.570.49–0.55Rapid to slow7.6Normal/ strike-slipY
Sanana5–2060?60Y1.270.44Rapid7.2Normal/strike-slipY
Rana10653–4>40NSfc rupture?1.01–1.960.23–1.53Maximal to slow>6.9?Strike-slipN
East Buru1048<148Y7.0Strike-slipY
Southern Seram5–1560260Y?M 7.6, 19501.84–2.081.36–1.88Slow7.2NormalY
Kawa15–401202120Y1.10–1.330.26–0.28Rapid to moderate7.5Strike-slipY
Bobol10–151002.5100N1.26–1.991.04–2.60Moderate to minimal7.4Strike-slipY
Combined Kawa–Bobol10–402402.5240Y?M 7.8, 18991.10–1.990.26–2.66Rapid to minimal7.8Strike-slipY
Seram FTB5–15135>2?135Y7.6ThrustY
Sorong (West Papua)45–75420<1420YM 7.4, 19441.14–2.850.27–8.68Rapid to minimal>8.0Strike-slipY
Koor15–35100675Y7.3Strike-slipY
Ransiki20–50100<1100YM 7.6, 20021.06–2.64Maximal to minimal7.4Strike-slipY
Yapen30–504202–3420YM 7.9, 1979>8.0Strike-slipY
Mamberamo10–20180<2?180YNumerous7.7ThrustY
Wandamen boundary6–2055255YSfc rupture?1.05–2.33Maximal to slow7.1NormalY
Lowlands30–70220??Y?Normal/strike-slipN
Paniai?150??Y?Normal/strike-slipN
Tarera–Aiduna30–60130790Y1.08–4.58Maximal to minimal7.4Strike-slipY
  • *Maximum length of segment(s) separated by step-overs <3 km wide.

  • Using scheme modified after McCalpin (2009).

  • Based on potential rupture length estimate and empirical length–magnitude relationships from Wells & Coppersmith (1994).