Earthquake with magnitude of Md 2.1 on date 21-02-1985 and time 02:05:59 (UTC) in region 6 km E Valfabbrica (PG)

A magnitude Md 2.1 earthquake occured in region: 6 km E Valfabbrica (PG), on

  • 21-02-1985 02:05:59 (UTC)
  • 21-02-1985 03:05:59 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.14, 12.67 at 9 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 6 3389 3389
Assisi PG 8 28299 31688
Nocera Umbra PG 10 5839 37527
Valtopina PG 11 1398 38925
Bastia Umbra PG 12 21874 60799
Gualdo Tadino PG 14 15208 76007
Spello PG 16 8645 84652
Cannara PG 17 4305 88957
Fossato di Vico PG 19 2840 91797
Foligno PG 20 57155 148952

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km N of Foligno (57155 inhabitants)
23 Km E of Perugia (166134 inhabitants)
64 Km N of Terni (111501 inhabitants)
74 Km SE of Arezzo (99543 inhabitants)
84 Km SW of Fano (60888 inhabitants)
87 Km SW of Ancona (100861 inhabitants)
89 Km S of Pesaro (94582 inhabitants)
92 Km NE of Viterbo (67173 inhabitants)
99 Km NW of Teramo (54892 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 1985-02-21
02:05:59
43.14 12.67 9 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 2079
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-21 02:05:59 ± 0.135
Latitude 43.14 ± 0.01
Longitude 12.67 ± 0.01
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2079

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) 1544.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 127
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
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) 0.00065
Epicentral distance of station farthest from the epicenter (degree) 0.00672
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:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 2079
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1985-02-21T02:06:26.00 10.0 undecidable manual SG 179 0.0067 0.3 0.4
--.PO9.Z. 1985-02-21T02:06:20.00 10.0 undecidable manual SG 160 0.0053 -0.71 0.1
--.MNS.Z. 1985-02-21T02:06:15.50 10.0 undecidable manual PG 179 0.0067 0.87 0.1
--.AR1.Z. 1985-02-21T02:06:15.00 10.0 undecidable manual SG 28 0.0037 0.08 0.6
--.CM8.Z. 1985-02-21T02:06:12.70 10.0 undecidable manual SG 79 0.0031 -0.18 0.8
--.PO9.Z. 1985-02-21T02:06:11.50 10.0 undecidable manual PG 160 0.0053 -0.25 1
--.AR1.Z. 1985-02-21T02:06:09.00 10.0 undecidable manual PG 28 0.0037 0.59 0.6
--.PRG.Z. 1985-02-21T02:06:08.00 10.0 undecidable manual SG 260 0.0018 0.12 0.9
--.CM8.Z. 1985-02-21T02:06:06.90 10.0 positive manual PG 79 0.0031 -0.33 1.1
--.PRG.Z. 1985-02-21T02:06:04.00 10.0 positive manual PG 260 0.0018 -0.34 2.2
--.AS1.Z. 1985-02-21T02:06:03.80 10.0 undecidable manual SG 190 0.0006 0.13 0.9
--.AS1.Z. 1985-02-21T02:06:02.00 10.0 positive manual PG 190 0.0006 0.09 3.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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