Earthquake with magnitude of Md 2.5 on date 30-05-1985 and time 08:23:26 (UTC) in region 3 km E Montefalco (PG)

A magnitude Md 2.5 earthquake occured in region: 3 km E Montefalco (PG), on

  • 30-05-1985 08:23:26 (UTC)
  • 30-05-1985 10:23:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.91, 12.69 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
Montefalco PG 3 5679 5679
Foligno PG 5 57155 62834
Trevi PG 6 8469 71303
Bevagna PG 7 5081 76384
Spello PG 10 8645 85029
Castel Ritaldi PG 10 3278 88307
Gualdo Cattaneo PG 11 6155 94462
Campello sul Clitunno PG 12 2442 96904
Giano dell'Umbria PG 12 3846 100750
Cannara PG 13 4305 105055
Valtopina PG 18 1398 106453
Assisi PG 19 28299 134752
Sellano PG 19 1079 135831
Spoleto PG 20 38218 174049

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km S of Foligno (57155 inhabitants)
33 Km SE of Perugia (166134 inhabitants)
39 Km N of Terni (111501 inhabitants)
73 Km NE of Viterbo (67173 inhabitants)
85 Km NW of L'Aquila (69753 inhabitants)
87 Km W of Teramo (54892 inhabitants)
90 Km SE of Arezzo (99543 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 2.5 1985-05-30
08:23:26
42.91 12.69 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 7579
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-05-30 08:23:26 ± 0.363
Latitude 42.91 ± 0.02
Longitude 12.69 ± 0.03
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 7579

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) 3184.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 198
Number of associated phases, regardless of their use for origin computation 5
Number of defining phases 5
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) 0.00138
Epicentral distance of station farthest from the epicenter (degree) 0.00389
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 7579
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:11:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.PO9.Z. 1985-05-30T08:23:42.00 10.0 undecidable manual SG 151 0.0034 1 0.1
--.CM2.Z. 1985-05-30T08:23:42.80 10.0 undecidable manual SG 49 0.0039 0.11 1
--.CM2.Z. 1985-05-30T08:23:35.70 10.0 undecidable manual PG 49 0.0039 -0.29 1.3
--.PO9.Z. 1985-05-30T08:23:34.50 10.0 undecidable manual PG 151 0.0034 -0.51 0.9
--.AS1.Z. 1985-05-30T08:23:31.00 10.0 undecidable manual PG 349 0.0014 0.17 1.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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