Earthquake with magnitude of Md 2.6 on date 23-11-1985 and time 23:59:49 (UTC) in region 2 km NW Valfabbrica (PG)

A magnitude Md 2.6 earthquake occured in region: 2 km NW Valfabbrica (PG), on

  • 23-11-1985 23:59:49 (UTC)
  • 24-11-1985 00:59:49 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.17, 12.58 at 11 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
Valfabbrica PG 2 3389 3389
Assisi PG 11 28299 31688
Bastia Umbra PG 12 21874 53562
Perugia PG 17 166134 219696
Gualdo Tadino PG 18 15208 234904
Nocera Umbra PG 18 5839 240743
Valtopina PG 19 1398 242141
Bettona PG 19 4367 246508
Cannara PG 19 4305 250813
Torgiano PG 20 6725 257538

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km E of Perugia (166134 inhabitants)
26 Km NW of Foligno (57155 inhabitants)
66 Km SE of Arezzo (99543 inhabitants)
68 Km N of Terni (111501 inhabitants)
83 Km SW of Fano (60888 inhabitants)
87 Km SW of Pesaro (94582 inhabitants)
91 Km SW of Ancona (100861 inhabitants)
92 Km NE of Viterbo (67173 inhabitants)
99 Km S of Rimini (147750 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 1985-11-23
23:59:49
43.17 12.58 11 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 16489
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-11-23 23:59:49 ± 0.188
Latitude 43.17 ± 0.01
Longitude 12.58 ± 0.02
Depth (km) 11 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 16489

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) 2045.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 104
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) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00105
Epicentral distance of station farthest from the epicenter (degree) 0.00907
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 16489
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:19:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1985-11-24T00:00:17.00 10.0 undecidable manual SG 174 0.007 0.55 0.3
--.AQU.Z. 1985-11-24T00:00:09.00 10.0 undecidable manual PN 143 0.0091 -0.09 0.9
--.ARV.Z. 1985-11-24T00:00:04.00 10.0 undecidable manual SG 38 0.0037 -0.65 0.1
--.MNS.Z. 1985-11-24T00:00:04.50 10.0 undecidable manual PG 174 0.007 -0.45 0.6
--.CRE.Z. 1985-11-24T00:00:03.00 10.0 undecidable manual PG 314 0.0057 0.77 0.2
--.ARV.Z. 1985-11-23T23:59:58.00 10.0 undecidable manual PG 38 0.0037 -0.13 1.4
--.PRG.Z. 1985-11-23T23:59:55.50 10.0 undecidable manual SG 243 0.0013 -0.54 0.3
--.PRG.Z. 1985-11-23T23:59:53.00 10.0 undecidable manual PG 243 0.0013 -0.16 2.6
--.ASS.Z. 1985-11-23T23:59:52.80 10.0 negative manual PG 154 0.0011 0.21 2.5
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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