Earthquake with magnitude of Md 2.6 on date 09-02-1987 and time 00:48:08 (Italy) in region 4 km NW Cerreto di Spoleto (PG)

A magnitude Md 2.6 earthquake occured in region: 4 km NW Cerreto di Spoleto (PG), on

  • 08-02-1987 23:48:08 (UTC)
  • 09-02-1987 00:48:08 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.84, 12.88 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
Cerreto di Spoleto PG 4 1075 1075
Sellano PG 7 1079 2154
Vallo di Nera PG 8 364 2518
Campello sul Clitunno PG 8 2442 4960
Trevi PG 11 8469 13429
Sant'Anatolia di Narco PG 12 564 13993
Preci PG 14 724 14717
Scheggino PG 15 461 15178
Poggiodomo PG 15 117 15295
Spoleto PG 16 38218 53513
Castel Ritaldi PG 17 3278 56791
Cascia PG 18 3217 60008
Norcia PG 19 4957 64965
Foligno PG 19 57155 122120
Montefalco PG 19 5679 127799
Monte Cavallo MC 20 145 127944

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km SE of Foligno (57155 inhabitants)
36 Km NE of Terni (111501 inhabitants)
49 Km SE of Perugia (166134 inhabitants)
69 Km NW of L'Aquila (69753 inhabitants)
71 Km W of Teramo (54892 inhabitants)
79 Km NE of Viterbo (67173 inhabitants)
94 Km N of Guidonia Montecelio (88673 inhabitants)
98 Km N of Tivoli (56533 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 2.6 1987-02-08
23:48:08
42.84 12.88 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 40859
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-02-08 23:48:08 ± 0.263
Latitude 42.84 ± 0.02
Longitude 12.88 ± 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 40859

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) 3212.4
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) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00243
Epicentral distance of station farthest from the epicenter (degree) 0.0119
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 40859
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:40:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SD1.Z. 1987-02-08T23:48:33.00 10.0 undecidable manual PN 148 0.0119 0.22 0.9
--.ARV.Z. 1987-02-08T23:48:32.50 10.0 undecidable manual SG 4 0.0059 0.95 0.3
--.CRE.Z. 1987-02-08T23:48:29.50 10.0 undecidable manual PG 319 0.0092 0.83 0.5
--.ALP.Z. 1987-02-08T23:48:27.26 10.0 undecidable manual SG 96 0.0045 0.43 0.6
--.ARV.Z. 1987-02-08T23:48:22.00 10.0 undecidable manual PG 4 0.0059 0.18 1.4
--.AQU.Z. 1987-02-08T23:48:21.50 10.0 undecidable manual PG 141 0.0056 0.33 1.2
--.ALP.Z. 1987-02-08T23:48:18.21 10.0 negative manual PG 96 0.0045 -0.88 1.2
--.ASS.Z. 1987-02-08T23:48:18.50 10.0 undecidable manual SG 323 0.0024 -0.73 0.3
--.ASS.Z. 1987-02-08T23:48:14.50 10.0 positive manual PG 323 0.0024 -0.2 2.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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