Earthquake with magnitude of Md 2.4 on date 10-10-1985 and time 23:05:33 (Italy) in region 4 km N Collazzone (PG)

A magnitude Md 2.4 earthquake occured in region: 4 km N Collazzone (PG), on

  • 10-10-1985 22:05:33 (UTC)
  • 10-10-1985 23:05:33 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.93, 12.44 at 22 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
Collazzone PG 4 3473 3473
Deruta PG 6 9669 13142
Marsciano PG 8 18902 32044
Bettona PG 10 4367 36411
Fratta Todina PG 10 1839 38250
Gualdo Cattaneo PG 10 6155 44405
Torgiano PG 10 6725 51130
Monte Castello di Vibio PG 12 1567 52697
Cannara PG 14 4305 57002
Bevagna PG 14 5081 62083
San Venanzo TR 15 2218 64301
Giano dell'Umbria PG 16 3846 68147
Todi PG 17 16851 84998
Bastia Umbra PG 18 21874 106872
Montefalco PG 18 5679 112551
Massa Martana PG 19 3770 116321
Perugia PG 20 166134 282455

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km S of Perugia (166134 inhabitants)
22 Km W of Foligno (57155 inhabitants)
45 Km NW of Terni (111501 inhabitants)
63 Km NE of Viterbo (67173 inhabitants)
74 Km SE of Arezzo (99543 inhabitants)
99 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 1985-10-10
22:05:33
42.93 12.44 22 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 14459
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-10-10 22:05:33 ± 0.48
Latitude 42.93 ± 0.02
Longitude 12.44 ± 0.04
Depth (km) 22 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 14459

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) 4444.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 188
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00146
Epicentral distance of station farthest from the epicenter (degree) 0.01425
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 3
Type of magnitude Md
Reference to an origin 14459
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:17:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SD1.Z. 1985-10-10T22:06:01.00 10.0 undecidable manual PN 139 0.0142 0.7 0.4
--.AR1.Z. 1985-10-10T22:05:56.50 10.0 undecidable manual SG 33 0.006 -1.08 0.2
--.MNS.Z. 1985-10-10T22:05:53.50 10.0 undecidable manual SG 161 0.0052 -1.05 0.1
--.AR1.Z. 1985-10-10T22:05:46.70 10.0 undecidable manual PG 33 0.006 -0.79 0.6
--.MNS.Z. 1985-10-10T22:05:45.30 10.0 undecidable manual PG 161 0.0052 -0.45 1.2
--.AS1.Z. 1985-10-10T22:05:44.00 10.0 undecidable manual SG 51 0.0018 0.46 0.7
--.PRG.Z. 1985-10-10T22:05:42.50 10.0 undecidable manual SG 350 0.0015 -0.21 0.9
--.AS1.Z. 1985-10-10T22:05:40.00 10.0 negative manual PG 51 0.0018 0.62 1.8
--.PRG.Z. 1985-10-10T22:05:39.00 10.0 undecidable manual PG 350 0.0015 0.09 3.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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