Earthquake with magnitude of Md 2.8 on date 26-08-1985 and time 04:43:53 (UTC) in region 10 km N Valfabbrica (PG)

A magnitude Md 2.8 earthquake occured in region: 10 km N Valfabbrica (PG), on

  • 26-08-1985 04:43:53 (UTC)
  • 26-08-1985 06:43:53 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.24, 12.63 at 18 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 10 3389 3389
Fossato di Vico PG 12 2840 6229
Gualdo Tadino PG 12 15208 21437
Gubbio PG 13 32216 53653
Sigillo PG 13 2404 56057
Costacciaro PG 14 1216 57273
Scheggia e Pascelupo PG 18 1393 58666
Assisi PG 19 28299 86965
Nocera Umbra PG 20 5839 92804

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km NE of Perugia (166134 inhabitants)
33 Km N of Foligno (57155 inhabitants)
66 Km E of Arezzo (99543 inhabitants)
74 Km SW of Fano (60888 inhabitants)
76 Km N of Terni (111501 inhabitants)
78 Km SW of Pesaro (94582 inhabitants)
83 Km SW of Ancona (100861 inhabitants)
91 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 2.8 1985-08-26
04:43:53
43.24 12.63 18 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 12369
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-08-26 04:43:53 ± 0.72
Latitude 43.24 ± 0.03
Longitude 12.63 ± 0.07
Depth (km) 18 ± 6 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 12369

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) 6564.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 122
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.003
Epicentral distance of station farthest from the epicenter (degree) 0.02841
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

Md:2.8

Field Value
Value 2.8
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 12369
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:15:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.RNI.Z. 1985-08-26T04:45:13.70 10.0 undecidable manual SN 333 0.0277 -1.57 0.2
--.SD1.Z. 1985-08-26T04:44:44.00 10.0 undecidable manual SN 150 0.0158 0.05 0.7
--.CAV.Z. 1985-08-26T04:44:41.00 10.0 undecidable manual PN 345 0.0284 -0.64 0.9
--.RNI.Z. 1985-08-26T04:44:40.00 10.0 undecidable manual PN 333 0.0277 -0.57 1
--.CTI.Z. 1985-08-26T04:44:38.00 10.0 undecidable manual PN 346 0.026 0.06 1.3
--.DDS.Z. 1985-08-26T04:44:37.70 10.0 undecidable manual PN 339 0.0254 0.59 1.1
--.AQU.Z. 1985-08-26T04:44:29.00 10.0 undecidable manual SN 147 0.0095 1.91 0.1
--.SD1.Z. 1985-08-26T04:44:23.00 10.0 undecidable manual PN 150 0.0158 0.51 1.5
--.MNS.Z. 1985-08-26T04:44:23.50 10.0 undecidable manual SN 177 0.0077 1.02 0.6
--.BD1.Z. 1985-08-26T04:44:22.20 10.0 undecidable manual PN 300 0.0151 0.79 1.2
--.AQU.Z. 1985-08-26T04:44:11.60 10.0 undecidable manual PN 147 0.0095 -1.16 0.8
--.MNS.Z. 1985-08-26T04:44:10.00 10.0 undecidable manual PN 177 0.0077 -0.09 1.8
--.ALP.Z. 1985-08-26T04:44:10.60 10.0 undecidable manual PN? 124 0.0074 0.98 0.4
--.AR1.Z. 1985-08-26T04:44:08.00 10.0 undecidable manual SG 41 0.003 1.61 0.2
--.CM2.Z. 1985-08-26T04:44:07.00 10.0 undecidable manual SG 98 0.0033 -0.46 1
--.AR1.Z. 1985-08-26T04:44:01.50 10.0 positive manual PG 41 0.003 0.7 2.7
--.CM2.Z. 1985-08-26T04:44:00.20 10.0 undecidable manual PG 98 0.0033 -1.22 1.5
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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