Earthquake with magnitude of Md 2.6 on date 20-03-1985 and time 03:17:22 (Italy) in region 3 km NW Assisi (PG)

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

  • 20-03-1985 02:17:22 (UTC)
  • 20-03-1985 03:17:22 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.09, 12.58 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
Assisi PG 3 28299 28299
Bastia Umbra PG 4 21874 50173
Valfabbrica PG 8 3389 53562
Cannara PG 10 4305 57867
Bettona PG 11 4367 62234
Spello PG 13 8645 70879
Torgiano PG 14 6725 77604
Valtopina PG 14 1398 79002
Perugia PG 16 166134 245136
Bevagna PG 17 5081 250217
Nocera Umbra PG 17 5839 256056
Foligno PG 17 57155 313211
Deruta PG 18 9669 322880
Gualdo Cattaneo PG 20 6155 329035

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km E of Perugia (166134 inhabitants)
17 Km NW of Foligno (57155 inhabitants)
59 Km N of Terni (111501 inhabitants)
71 Km SE of Arezzo (99543 inhabitants)
84 Km NE of Viterbo (67173 inhabitants)
91 Km SW of Fano (60888 inhabitants)
95 Km S of Pesaro (94582 inhabitants)
96 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
Bulletin
Rev1000
Md 2.6 1985-03-20
02:17:22
43.09 12.59 10 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 3379
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-03-20 02:17:22 ± 0.283
Latitude 43.09 ± 0.02
Longitude 12.59 ± 0.04
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 3379

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) 4329.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 145
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00049
Epicentral distance of station farthest from the epicenter (degree) 0.0085
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 6
Type of magnitude Md
Reference to an origin 3379
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:08:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1985-03-20T02:17:48.50 10.0 undecidable manual SG 174 0.0063 1.8 0
--.CH1.Z. 1985-03-20T02:17:47.00 10.0 undecidable manual SG 319 0.0064 0.12 0.8
--.PO9.Z. 1985-03-20T02:17:42.00 10.0 undecidable manual SG 152 0.0051 -0.52 0.5
--.AR1.Z. 1985-03-20T02:17:41.00 10.0 undecidable manual SG 32 0.0044 1.31 0.1
--.AQU.Z. 1985-03-20T02:17:40.00 10.0 undecidable manual PG 140 0.0085 -0.79 0.6
--.MNS.Z. 1985-03-20T02:17:37.00 10.0 undecidable manual PG 174 0.0063 0.68 0.8
--.CH1.Z. 1985-03-20T02:17:36.00 10.0 negative manual PG 319 0.0064 -0.42 2.2
--.PO9.Z. 1985-03-20T02:17:33.00 10.0 undecidable manual PG 152 0.0051 -0.91 0.6
--.AR1.Z. 1985-03-20T02:17:32.00 10.0 undecidable manual PG 32 0.0044 -0.27 1.4
--.AS1.Z. 1985-03-20T02:17:26.00 10.0 undecidable manual SG 116 0.0005 -0.2 0.9
--.AS1.Z. 1985-03-20T02:17:24.50 10.0 positive manual PG 116 0.0005 0.01 3.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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