Earthquake with magnitude of Md 2.5 on date 16-08-1985 and time 17:30:34 (Italy) in region 3 km W Trevi (PG)

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

  • 16-08-1985 15:30:34 (UTC)
  • 16-08-1985 17:30:34 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.87, 12.71 at 6 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
Trevi PG 3 8469 8469
Montefalco PG 6 5679 14148
Castel Ritaldi PG 6 3278 17426
Campello sul Clitunno PG 8 2442 19868
Foligno PG 10 57155 77023
Bevagna PG 11 5081 82104
Giano dell'Umbria PG 11 3846 85950
Gualdo Cattaneo PG 13 6155 92105
Spello PG 14 8645 100750
Spoleto PG 15 38218 138968
Vallo di Nera PG 17 364 139332
Cannara PG 18 4305 143637
Cerreto di Spoleto PG 18 1075 144712
Sellano PG 18 1079 145791
Sant'Anatolia di Narco PG 18 564 146355
Massa Martana PG 18 3770 150125
Scheggino PG 20 461 150586

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km S of Foligno (57155 inhabitants)
35 Km N of Terni (111501 inhabitants)
37 Km SE of Perugia (166134 inhabitants)
70 Km NE of Viterbo (67173 inhabitants)
80 Km NW of L'Aquila (69753 inhabitants)
84 Km W of Teramo (54892 inhabitants)
95 Km SE of Arezzo (99543 inhabitants)
96 Km N of Guidonia Montecelio (88673 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
Bulletin
Rev1000
Md 2.5 1985-08-16
15:30:34
42.87 12.71 6 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 11879
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-08-16 15:30:34 ± 1.235
Latitude 42.87 ± 0.06
Longitude 12.71 ± 0.16
Depth (km) 6 ± 12 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 11879

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) 14199.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 303
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
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) 0.00178
Epicentral distance of station farthest from the epicenter (degree) 0.00583
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 11879
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:15:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AR1.Z. 1985-08-16T15:30:59.00 10.0 undecidable manual SG 14 0.0058 1.19 0.1
--.CM2.Z. 1985-08-16T15:30:51.00 10.0 undecidable manual SG 43 0.004 -0.38 0.8
--.AR1.Z. 1985-08-16T15:30:47.00 10.0 undecidable manual PG 14 0.0058 -0.83 0.5
--.CM2.Z. 1985-08-16T15:30:44.50 10.0 undecidable manual PG 43 0.004 0.39 1.3
--.AS1.Z. 1985-08-16T15:30:41.50 10.0 undecidable manual SG 347 0.0018 -0.64 0.4
--.AS1.Z. 1985-08-16T15:30:39.00 10.0 positive manual PG 347 0.0018 0.22 3.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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