Earthquake with magnitude of Md 2.1 on date 26-11-1987 and time 11:39:54 (UTC) in region 3 km NE Cerreto di Spoleto (PG)

A magnitude Md 2.1 earthquake occured in region: 3 km NE Cerreto di Spoleto (PG), on

  • 26-11-1987 11:39:54 (UTC)
  • 26-11-1987 12:39:54 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.84, 12.95 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 6 1079 2154
Preci PG 9 724 2878
Vallo di Nera PG 11 364 3242
Norcia PG 13 4957 8199
Campello sul Clitunno PG 14 2442 10641
Poggiodomo PG 14 117 10758
Cascia PG 15 3217 13975
Sant'Anatolia di Narco PG 15 564 14539
Visso MC 15 1107 15646
Trevi PG 17 8469 24115
Scheggino PG 17 461 24576
Monte Cavallo MC 18 145 24721
Castelsantangelo sul Nera MC 18 281 25002
Ussita MC 19 444 25446

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SE of Foligno (57155 inhabitants)
40 Km NE of Terni (111501 inhabitants)
54 Km SE of Perugia (166134 inhabitants)
65 Km W of Teramo (54892 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
84 Km NE of Viterbo (67173 inhabitants)
95 Km N of Guidonia Montecelio (88673 inhabitants)
98 Km SW of Ancona (100861 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
Rev 1000 Md 2.1 1987-11-26
11:39:54
42.84 12.95 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 58859
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-11-26 11:39:54 ± 0.192
Latitude 42.84 ± 0.01
Longitude 12.95 ± 0.02
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 58859

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) 1974.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 203
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00275
Epicentral distance of station farthest from the epicenter (degree) 0.00591
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:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 58859
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:56:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-11-26T11:40:18.18 10.0 undecidable manual SG 359 0.0059 0.48 0.1
--.MNS.Z. 1987-11-26T11:40:12.84 10.0 undecidable manual SG 203 0.0045 0.27 0.4
--.ARV.Z. 1987-11-26T11:40:07.76 10.0 undecidable manual PG 359 0.0059 -0.21 1.1
--.ASS.Z. 1987-11-26T11:40:06.35 10.0 undecidable manual SG 315 0.0028 -0.18 0.6
--.MNS.Z. 1987-11-26T11:40:04.92 10.0 undecidable manual PG 203 0.0045 -0.1 1.9
--.ASS.Z. 1987-11-26T11:40:01.61 10.0 undecidable manual PG 315 0.0028 0.08 2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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