Earthquake with magnitude of Md 2.6 on date 18-03-1985 and time 00:24:11 (UTC) in region 6 km W San Venanzo (TR)

A magnitude Md 2.6 earthquake occured in region: 6 km W San Venanzo (TR), on

  • 18-03-1985 00:24:11 (UTC)
  • 18-03-1985 01:24:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.87, 12.19 at 4 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
San Venanzo TR 6 2218 2218
Parrano TR 7 534 2752
Montegabbione TR 10 1216 3968
Ficulle TR 11 1669 5637
Monteleone d'Orvieto TR 13 1467 7104
Marsciano PG 13 18902 26006
Monte Castello di Vibio PG 14 1567 27573
Fratta Todina PG 14 1839 29412
Piegaro PG 14 3669 33081
Fabro TR 15 2876 35957
Città della Pieve PG 18 7712 43669
Orvieto TR 18 20630 64299
Allerona TR 19 1794 66093
Panicale PG 19 5692 71785
Paciano PG 20 975 72760
Castel Viscardo TR 20 2938 75698

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Perugia (166134 inhabitants)
43 Km W of Foligno (57155 inhabitants)
51 Km NW of Terni (111501 inhabitants)
51 Km N of Viterbo (67173 inhabitants)
71 Km SE of Arezzo (99543 inhabitants)
86 Km SE of Siena (53903 inhabitants)
89 Km E of Grosseto (82087 inhabitants)
92 Km NE of Civitavecchia (52991 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 Md 2.6 1985-03-18
00:24:11
42.87 12.19 4 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 3339
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-03-18 00:24:11 ± 0.9
Latitude 42.87 ± 0.02
Longitude 12.19 ± 0.05
Depth (km) 4 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 3339

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 4770.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 203
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00542
Epicentral distance of station farthest from the epicenter (degree) 0.01498
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 3339
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:08:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SD1.Z. 1985-03-18T00:25:04.00 10.0 undecidable manual SN 133 0.015 0.49 0.5
--.SD1.Z. 1985-03-18T00:24:41.50 10.0 undecidable manual PN? 133 0.015 -0.2 0.5
--.CH1.Z. 1985-03-18T00:24:40.50 10.0 undecidable manual SG 347 0.007 0.62 0.5
--.AR1.Z. 1985-03-18T00:24:40.50 10.0 undecidable manual SG 41 0.0074 -1.14 0.2
--.MNS.Z. 1985-03-18T00:24:34.00 10.0 undecidable manual SG 143 0.0054 -0.23 1.1
--.AQU.Z. 1985-03-18T00:24:33.50 10.0 negative manual PG 119 0.0092 0.82 2
--.AR1.Z. 1985-03-18T00:24:29.00 10.0 undecidable manual PG 41 0.0074 -0.07 1.9
--.CH1.Z. 1985-03-18T00:24:28.00 10.0 undecidable manual PG 347 0.007 -0.05 1.9
--.MNS.Z. 1985-03-18T00:24:23.50 10.0 undecidable manual PG 143 0.0054 -1.29 0.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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