Earthquake with magnitude of Md 2.5 on date 16-09-1987 and time 13:05:48 (Italy) in region 1 km S Trevi (PG)

A magnitude Md 2.5 earthquake occured in region: 1 km S Trevi (PG), on

  • 16-09-1987 11:05:48 (UTC)
  • 16-09-1987 13:05:48 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8710, 12.7460 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
Trevi PG 1 8469 8469
Campello sul Clitunno PG 6 2442 10911
Castel Ritaldi PG 8 3278 14189
Montefalco PG 8 5679 19868
Foligno PG 10 57155 77023
Bevagna PG 13 5081 82104
Giano dell'Umbria PG 14 3846 85950
Vallo di Nera PG 15 364 86314
Spello PG 15 8645 94959
Sellano PG 15 1079 96038
Cerreto di Spoleto PG 15 1075 97113
Spoleto PG 15 38218 135331
Gualdo Cattaneo PG 16 6155 141486
Sant'Anatolia di Narco PG 17 564 142050
Scheggino PG 19 461 142511
Cannara PG 19 4305 146816

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km SE of Foligno (57155 inhabitants)
35 Km N of Terni (111501 inhabitants)
39 Km SE of Perugia (166134 inhabitants)
73 Km NE of Viterbo (67173 inhabitants)
79 Km NW of L'Aquila (69753 inhabitants)
82 Km W of Teramo (54892 inhabitants)
96 Km SE of Arezzo (99543 inhabitants)
97 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 1987-09-16
11:05:48
42.871 12.746 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 55419
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-09-16 11:05:48 ± 0.343
Latitude 42.8710 ± 0.0168
Longitude 12.7460 ± 0.0170
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 55419

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) 2325.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 298
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) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00178
Epicentral distance of station farthest from the epicenter (degree) 0.00575
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 55419
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:53:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.ARV.Z. 1987-09-16T11:06:10.50 10.0 undecidable manual SG 12 0.6327 -0.13 0.4
--.ARV.Z. 1987-09-16T11:06:01.50 10.0 undecidable manual PG 12 0.6327 0.41 0.2
--.CM8.Z. 1987-09-16T11:05:57.40 10.0 undecidable manual PG 41 0.4329 -0.18 1
--.ASS.Z. 1987-09-16T11:05:56.50 10.0 undecidable manual SG 340 0.1998 0.02 0.9
--.ASS.Z. 1987-09-16T11:05:52.80 10.0 positive manual PG 340 0.1998 -0.12 2.5
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download