Earthquake with magnitude of Md 2.6 on date 28-03-1985 and time 08:26:37 (UTC) in region 11 km NW Valfabbrica (PG)

A magnitude Md 2.6 earthquake occured in region: 11 km NW Valfabbrica (PG), on

  • 28-03-1985 08:26:37 (UTC)
  • 28-03-1985 09:26:37 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.24, 12.53 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 11 3389 3389
Gubbio PG 13 32216 35605
Umbertide PG 18 16681 52286
Perugia PG 19 166134 218420
Costacciaro PG 20 1216 219636
Fossato di Vico PG 20 2840 222476
Bastia Umbra PG 20 21874 244350
Sigillo PG 20 2404 246754

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km NE of Perugia (166134 inhabitants)
35 Km NW of Foligno (57155 inhabitants)
58 Km E of Arezzo (99543 inhabitants)
77 Km N of Terni (111501 inhabitants)
78 Km SW of Fano (60888 inhabitants)
80 Km SW of Pesaro (94582 inhabitants)
90 Km W of Ancona (100861 inhabitants)
91 Km S of Rimini (147750 inhabitants)
97 Km E of Siena (53903 inhabitants)
98 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 2.6 1985-03-28
08:26:37
43.25 12.53 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 3749
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-03-28 08:26:37 ± 0.255
Latitude 43.25 ± 0.01
Longitude 12.53 ± 0.03
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 3749

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) 2450.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 139
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) 0.00178
Epicentral distance of station farthest from the epicenter (degree) 0.00777
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 3749
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:08:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.PO9.Z. 1985-03-28T08:27:03.00 10.0 undecidable manual SG 155 0.0066 0.14 0.5
--.CH1.Z. 1985-03-28T08:26:58.00 10.0 undecidable manual SG 312 0.0051 0.47 0.3
--.MNS.Z. 1985-03-28T08:26:56.00 10.0 undecidable manual PG? 172 0.0078 1.48 0
--.PO9.Z. 1985-03-28T08:26:52.00 10.0 undecidable manual PG 155 0.0066 -0.07 1.2
--.AR1.Z. 1985-03-28T08:26:51.50 10.0 undecidable manual SG 49 0.0035 -0.37 0.6
--.CH1.Z. 1985-03-28T08:26:48.50 10.0 undecidable manual PG 312 0.0051 -0.5 0.7
--.AR1.Z. 1985-03-28T08:26:46.00 10.0 undecidable manual PG 49 0.0035 0.27 2.4
--.AS1.Z. 1985-03-28T08:26:45.50 10.0 undecidable manual SG 153 0.0018 -0.29 0.7
--.AS1.Z. 1985-03-28T08:26:42.00 10.0 negative manual PG 153 0.0018 -0.22 2.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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