Earthquake with magnitude of Md 2.6 on date 31-08-1985 and time 03:54:19 (UTC) in region 3 km NE Sellano (PG)

A magnitude Md 2.6 earthquake occured in region: 3 km NE Sellano (PG), on

  • 31-08-1985 03:54:19 (UTC)
  • 31-08-1985 05:54:19 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.91, 12.95 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
Sellano PG 3 1079 1079
Preci PG 8 724 1803
Monte Cavallo MC 10 145 1948
Cerreto di Spoleto PG 11 1075 3023
Visso MC 11 1107 4130
Ussita MC 16 444 4574
Castelsantangelo sul Nera MC 17 281 4855
Pieve Torina MC 17 1458 6313
Trevi PG 17 8469 14782
Vallo di Nera PG 18 364 15146
Campello sul Clitunno PG 18 2442 17588
Serravalle di Chienti MC 18 1070 18658
Norcia PG 18 4957 23615
Fiordimonte MC 18 202 23817
Pievebovigliana MC 20 866 24683

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km E of Foligno (57155 inhabitants)
46 Km NE of Terni (111501 inhabitants)
51 Km E of Perugia (166134 inhabitants)
68 Km W of Teramo (54892 inhabitants)
72 Km NW of L'Aquila (69753 inhabitants)
89 Km NE of Viterbo (67173 inhabitants)
91 Km SW of Ancona (100861 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 1985-08-31
03:54:19
42.91 12.95 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 12499
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-08-31 03:54:19 ± 0.344
Latitude 42.91 ± 0.01
Longitude 12.95 ± 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 12499

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) 2596.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 201
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) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00235
Epicentral distance of station farthest from the epicenter (degree) 0.00518
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:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 12499
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:15:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1985-08-31T03:54:40.50 10.0 undecidable manual SG 200 0.005 0.85 0.2
--.AR1.Z. 1985-08-31T03:54:40.50 10.0 undecidable manual SG 359 0.0052 0.25 0.8
--.AR1.Z. 1985-08-31T03:54:31.50 10.0 undecidable manual PG 359 0.0052 -0.01 1.6
--.MNS.Z. 1985-08-31T03:54:30.50 10.0 undecidable manual PG 200 0.005 -0.67 0.5
--.AS1.Z. 1985-08-31T03:54:30.00 10.0 undecidable manual SG 303 0.0023 0.01 1.1
--.AS1.Z. 1985-08-31T03:54:25.50 10.0 undecidable manual PG 303 0.0023 -0.09 1.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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