Earthquake with magnitude of Md 2.5 on date 25-08-1987 and time 17:31:44 (UTC) in region 1 km NE Cascia (PG)

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

  • 25-08-1987 17:31:44 (UTC)
  • 25-08-1987 19:31:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7310, 13.0210 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
Cascia PG 1 3217 3217
Poggiodomo PG 7 117 3334
Norcia PG 9 4957 8291
Monteleone di Spoleto PG 10 599 8890
Cerreto di Spoleto PG 13 1075 9965
Vallo di Nera PG 14 364 10329
Sant'Anatolia di Narco PG 15 564 10893
Scheggino PG 16 461 11354
Preci PG 17 724 12078
Cittareale RI 17 482 12560
Accumoli RI 19 667 13227
Sellano PG 19 1079 14306
Leonessa RI 19 2435 16741

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km NE of Terni (111501 inhabitants)
36 Km SE of Foligno (57155 inhabitants)
52 Km NW of L'Aquila (69753 inhabitants)
57 Km W of Teramo (54892 inhabitants)
66 Km SE of Perugia (166134 inhabitants)
83 Km E of Viterbo (67173 inhabitants)
85 Km N of Guidonia Montecelio (88673 inhabitants)
87 Km N of Tivoli (56533 inhabitants)
96 Km W of Montesilvano (53738 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
ML-VAX 2.0
1987-08-25
17:31:44
42.731 13.021 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 54439
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-08-25 17:31:44 ± 0.293
Latitude 42.7310 ± 0.0172
Longitude 13.0210 ± 0.0279
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 54439

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) 2971.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 171
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) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00356
Epicentral distance of station farthest from the epicenter (degree) 0.01052
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 54439
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:52:28

ML:2.0

Field Value
Value 2.0
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 54439
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.ARV.Z. 1987-08-25T17:32:12.17 10.0 undecidable manual SG 356 0.7659 1.16 0
--.SDI.Z. 1987-08-25T17:32:06.79 10.0 undecidable manual PN 150 1.1655 0.21 0.9
--.ASS.Z. 1987-08-25T17:32:00.45 10.0 undecidable manual SG 321 0.4218 0.43 0.4
--.ARV.Z. 1987-08-25T17:32:00.00 10.0 undecidable manual PG 356 0.7659 0.25 1.1
--.ALP.Z. 1987-08-25T17:31:59.90 10.0 undecidable manual SG 83 0.3996 0.63 0.4
--.AQU.Z. 1987-08-25T17:31:54.60 10.0 undecidable manual PG 143 0.4662 0.41 1
--.CM8.Z. 1987-08-25T17:31:54.70 10.0 positive manual PG 11 0.4662 -0.17 2.8
--.ALP.Z. 1987-08-25T17:31:52.46 10.0 positive manual PG 83 0.3996 -0.51 1.7
--.ASS.Z. 1987-08-25T17:31:52.82 10.0 undecidable manual PG 321 0.4218 -0.59 0.7
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