Earthquake with magnitude of Md 2.1 on date 16-04-1985 and time 12:26:08 (UTC) in region 8 km NE Valfabbrica (PG)

A magnitude Md 2.1 earthquake occured in region: 8 km NE Valfabbrica (PG), on

  • 16-04-1985 12:26:08 (UTC)
  • 16-04-1985 14:26:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.23, 12.64 at 10 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 8 3389 3389
Gualdo Tadino PG 12 15208 18597
Fossato di Vico PG 13 2840 21437
Sigillo PG 14 2404 23841
Gubbio PG 15 32216 56057
Costacciaro PG 16 1216 57273
Assisi PG 18 28299 85572
Nocera Umbra PG 18 5839 91411
Bastia Umbra PG 19 21874 113285
Scheggia e Pascelupo PG 20 1393 114678

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km NE of Perugia (166134 inhabitants)
31 Km N of Foligno (57155 inhabitants)
67 Km E of Arezzo (99543 inhabitants)
74 Km N of Terni (111501 inhabitants)
75 Km SW of Fano (60888 inhabitants)
79 Km S of Pesaro (94582 inhabitants)
83 Km SW of Ancona (100861 inhabitants)
93 Km S of Rimini (147750 inhabitants)
100 Km NE of Viterbo (67173 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 2.1 1985-04-16
12:26:08
43.23 12.64 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 4759
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-16 12:26:08 ± 1.273
Latitude 43.23 ± 0.05
Longitude 12.64 ± 0.20
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 4759

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) 17372.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 221
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00146
Epicentral distance of station farthest from the epicenter (degree) 0.00753
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 4759
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:09:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1985-04-16T12:26:38.00 10.0 undecidable manual SG 177 0.0075 0.26 0.4
--.MNS.Z. 1985-04-16T12:26:27.00 10.0 undecidable manual PG 177 0.0075 1.51 0.2
--.AR1.Z. 1985-04-16T12:26:22.00 10.0 undecidable manual SG 39 0.0031 0.14 0.6
--.AR1.Z. 1985-04-16T12:26:16.00 10.0 positive manual PG 39 0.0031 -0.32 2.7
--.AS1.Z. 1985-04-16T12:26:15.50 10.0 undecidable manual SG 176 0.0015 -0.5 0.5
--.AS1.Z. 1985-04-16T12:26:12.00 10.0 negative manual PG 176 0.0015 -0.93 1.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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