Earthquake with magnitude of Md 2.0 on date 09-10-1987 and time 08:42:11 (UTC) in region 6 km S Norcia (PG)

A magnitude Md 2.0 earthquake occured in region: 6 km S Norcia (PG), on

  • 09-10-1987 08:42:11 (UTC)
  • 09-10-1987 09:42:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.74, 13.1 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
Norcia PG 6 4957 4957
Cascia PG 7 3217 8174
Accumoli RI 13 667 8841
Poggiodomo PG 14 117 8958
Cittareale RI 14 482 9440
Monteleone di Spoleto PG 15 599 10039
Arquata del Tronto AP 17 1178 11217
Preci PG 17 724 11941
Cerreto di Spoleto PG 18 1075 13016
Castelsantangelo sul Nera MC 18 281 13297
Amatrice RI 19 2657 15954
Vallo di Nera PG 20 364 16318

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km SE of Foligno (57155 inhabitants)
42 Km E of Terni (111501 inhabitants)
49 Km NW of L'Aquila (69753 inhabitants)
50 Km W of Teramo (54892 inhabitants)
71 Km SE of Perugia (166134 inhabitants)
87 Km NE of Guidonia Montecelio (88673 inhabitants)
89 Km E of Viterbo (67173 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
89 Km N of Tivoli (56533 inhabitants)
96 Km W of Pescara (121014 inhabitants)
97 Km W of Chieti (51815 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 2.0 1987-10-09
08:42:11
42.74 13.1 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 56749
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-10-09 08:42:11 ± 0.364
Latitude 42.74 ± 0.02
Longitude 13.10 ± 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 56749

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) 2572.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 232
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
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) 0.00308
Epicentral distance of station farthest from the epicenter (degree) 0.00688
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2

Field Value
Value 2
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 56749
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:54:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ASS.Z. 1987-10-09T08:42:29.50 10.0 undecidable manual SG 315 0.0041 0.87 0.1
--.CM8.Z. 1987-10-09T08:42:28.39 10.0 undecidable manual SG 4 0.0041 -0.11 1.1
--.ARV.Z. 1987-10-09T08:42:27.00 10.0 undecidable manual PG 351 0.0069 -0.23 1.2
--.ALP.Z. 1987-10-09T08:42:25.17 10.0 undecidable manual SG 82 0.0031 0.39 0.7
--.ASS.Z. 1987-10-09T08:42:21.20 10.0 undecidable manual PG 315 0.0041 -0.33 1.3
--.CM8.Z. 1987-10-09T08:42:21.32 10.0 undecidable manual PG 4 0.0041 -0.13 1.8
--.ALP.Z. 1987-10-09T08:42:19.26 10.0 undecidable manual PG? 82 0.0031 -0.04 0.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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