Earthquake with magnitude of Md 2.4 on date 24-02-1985 and time 21:09:26 (Italy) in region 7 km NW Valfabbrica (PG)

A magnitude Md 2.4 earthquake occured in region: 7 km NW Valfabbrica (PG), on

  • 24-02-1985 20:09:26 (UTC)
  • 24-02-1985 21:09:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.2, 12.54 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 7 3389 3389
Bastia Umbra PG 15 21874 25263
Assisi PG 16 28299 53562
Perugia PG 16 166134 219696
Gubbio PG 18 32216 251912

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km NE of Perugia (166134 inhabitants)
30 Km NW of Foligno (57155 inhabitants)
61 Km E of Arezzo (99543 inhabitants)
71 Km N of Terni (111501 inhabitants)
82 Km SW of Fano (60888 inhabitants)
85 Km SW of Pesaro (94582 inhabitants)
92 Km SW of Ancona (100861 inhabitants)
94 Km NE of Viterbo (67173 inhabitants)
96 Km S of Rimini (147750 inhabitants)
98 Km E of Siena (53903 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 2.4 1985-02-24
20:09:26
43.2 12.54 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 2399
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-24 20:09:26 ± 0.298
Latitude 43.20 ± 0.01
Longitude 12.54 ± 0.02
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2399

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) 2487.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 89
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
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) 0.00121
Epicentral distance of station farthest from the epicenter (degree) 0.00737
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 2399
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.PO9.Z. 1985-02-24T20:09:52.00 10.0 undecidable manual SG 154 0.0062 1.09 0.1
--.CH1.Z. 1985-02-24T20:09:49.50 10.0 undecidable manual SG 315 0.0054 1.34 0.1
--.MNS.Z. 1985-02-24T20:09:44.00 10.0 undecidable manual PG 172 0.0074 0.88 0.4
--.AR1.Z. 1985-02-24T20:09:42.00 10.0 undecidable manual SG 44 0.0037 -0.29 0.8
--.CM8.Z. 1985-02-24T20:09:42.70 10.0 undecidable manual SG 90 0.004 -0.29 0.8
--.PO9.Z. 1985-02-24T20:09:40.50 10.0 undecidable manual PG 154 0.0062 -0.23 1.1
--.CH1.Z. 1985-02-24T20:09:39.60 10.0 undecidable manual PG 315 0.0054 0.45 1
--.CM8.Z. 1985-02-24T20:09:36.00 10.0 positive manual PG 90 0.004 -0.16 3
--.AR1.Z. 1985-02-24T20:09:35.50 10.0 undecidable manual PG 44 0.0037 -0.26 1.4
--.AS1.Z. 1985-02-24T20:09:34.00 10.0 undecidable manual SG 147 0.0014 0.11 0.9
--.PRG.Z. 1985-02-24T20:09:32.50 10.0 undecidable manual SG 226 0.0012 -0.71 0.3
--.AS1.Z. 1985-02-24T20:09:31.10 10.0 negative manual PG 147 0.0014 0.2 2.9
--.PRG.Z. 1985-02-24T20:09:29.00 10.0 undecidable manual PG 226 0.0012 -1.51 0.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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