Earthquake with magnitude of Md 2.4 on date 25-04-1987 and time 23:26:43 (Italy) in region 5 km NE Polino (TR)

A magnitude Md 2.4 earthquake occured in region: 5 km NE Polino (TR), on

  • 25-04-1987 21:26:43 (UTC)
  • 25-04-1987 23:26:43 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.62, 12.89 at 17 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
Polino TR 5 233 233
Monteleone di Spoleto PG 6 599 832
Ferentillo TR 8 1913 2745
Leonessa RI 9 2435 5180
Montefranco TR 10 1276 6456
Arrone TR 11 2763 9219
Poggiodomo PG 11 117 9336
Morro Reatino RI 11 373 9709
Scheggino PG 12 461 10170
Rivodutri RI 12 1253 11423
Labro RI 13 374 11797
Poggio Bustone RI 13 2055 13852
Sant'Anatolia di Narco PG 14 564 14416
Cascia PG 15 3217 17633
Colli sul Velino RI 16 533 18166
Cantalice RI 17 2755 20921
Vallo di Nera PG 17 364 21285
Spoleto PG 18 38218 59503
Posta RI 20 694 60197

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km E of Terni (111501 inhabitants)
41 Km SE of Foligno (57155 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
67 Km W of Teramo (54892 inhabitants)
68 Km E of Viterbo (67173 inhabitants)
68 Km SE of Perugia (166134 inhabitants)
70 Km N of Guidonia Montecelio (88673 inhabitants)
73 Km N of Tivoli (56533 inhabitants)
87 Km NE of Roma (2864731 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 1987-04-25
21:26:43
42.62 12.89 17 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 45669
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-25 21:26:43 ± 0.25
Latitude 42.62 ± 0.01
Longitude 12.89 ± 0.05
Depth (km) 17 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 45669

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) 4259.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 140
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) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00251
Epicentral distance of station farthest from the epicenter (degree) 0.0102
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 2
Type of magnitude Md
Reference to an origin 45669
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:44:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SDI.Z. 1987-04-25T21:27:20.50 10.0 undecidable manual SN 142 0.0102 0.51 0.2
--.ARV.Z. 1987-04-25T21:27:14.00 10.0 undecidable manual SN 2 0.0079 0.09 1
--.CP9.Z. 1987-04-25T21:27:10.50 10.0 undecidable manual SG 176 0.0068 0.35 0.4
--.SDI.Z. 1987-04-25T21:27:03.50 10.0 undecidable manual PN 142 0.0102 -1.2 0.3
--.ARV.Z. 1987-04-25T21:27:01.50 10.0 undecidable manual PN 2 0.0079 0.32 1.2
--.ASS.Z. 1987-04-25T21:27:01.50 10.0 undecidable manual SG 338 0.0042 0.32 1.1
--.CP9.Z. 1987-04-25T21:26:59.20 10.0 undecidable manual PG 176 0.0068 0.19 1.4
--.MNS.Z. 1987-04-25T21:26:55.20 10.0 undecidable manual SG 213 0.0025 0.13 1.2
--.ASS.Z. 1987-04-25T21:26:53.50 10.0 undecidable manual PG 338 0.0042 -0.34 1.7
--.MNS.Z. 1987-04-25T21:26:50.00 10.0 undecidable manual PG 213 0.0025 -0.3 1.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download