Earthquake with magnitude of Md 2.4 on date 16-03-1985 and time 19:07:56 (Italy) in region 6 km NW Bastia Umbra (PG)

A magnitude Md 2.4 earthquake occured in region: 6 km NW Bastia Umbra (PG), on

  • 16-03-1985 18:07:56 (UTC)
  • 16-03-1985 19:07:56 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.11, 12.5 at 7 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
Bastia Umbra PG 6 21874 21874
Perugia PG 9 166134 188008
Valfabbrica PG 10 3389 191397
Torgiano PG 10 6725 198122
Assisi PG 10 28299 226421
Bettona PG 10 4367 230788
Cannara PG 14 4305 235093
Deruta PG 15 9669 244762
Corciano PG 17 21332 266094
Spello PG 19 8645 274739

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km E of Perugia (166134 inhabitants)
24 Km NW of Foligno (57155 inhabitants)
62 Km N of Terni (111501 inhabitants)
64 Km SE of Arezzo (99543 inhabitants)
83 Km NE of Viterbo (67173 inhabitants)
92 Km SW of Fano (60888 inhabitants)
96 Km SW of Pesaro (94582 inhabitants)
97 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 1985-03-16
18:07:56
43.11 12.5 7 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 3309
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-03-16 18:07:56 ± 0.624
Latitude 43.11 ± 0.02
Longitude 12.50 ± 0.05
Depth (km) 7 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 3309

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) 5048.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 153
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
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) 0.00105
Epicentral distance of station farthest from the epicenter (degree) 0.00656
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:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 3309
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:08:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1985-03-16T18:08:23.50 10.0 undecidable manual SG 169 0.0066 1.28 0.1
--.CH1.Z. 1985-03-16T18:08:20.00 10.0 undecidable manual SG 322 0.0058 0.32 0.4
--.AR1.Z. 1985-03-16T18:08:16.00 10.0 undecidable manual SG 39 0.0045 1.09 0.2
--.PO9.Z. 1985-03-16T18:08:16.50 10.0 undecidable manual SG 148 0.0056 -2.18 0
--.MNS.Z. 1985-03-16T18:08:11.80 10.0 positive manual PG 169 0.0066 0.57 1.7
--.CH1.Z. 1985-03-16T18:08:09.00 10.0 undecidable manual PG 322 0.0058 -0.77 0.7
--.PO9.Z. 1985-03-16T18:08:08.50 10.0 undecidable manual PG 148 0.0056 -0.69 0.8
--.AR1.Z. 1985-03-16T18:08:07.00 10.0 undecidable manual PG 39 0.0045 -0.02 2.8
--.AS1.Z. 1985-03-16T18:08:01.20 10.0 undecidable manual SG 111 0.0011 -0.37 0.7
--.AS1.Z. 1985-03-16T18:07:59.50 10.0 positive manual PG 111 0.0011 0.19 2.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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