Earthquake with magnitude of Md 2.2 on date 28-09-1987 and time 15:58:33 (UTC) in region 3 km N Norcia (PG)

A magnitude Md 2.2 earthquake occured in region: 3 km N Norcia (PG), on

  • 28-09-1987 15:58:33 (UTC)
  • 28-09-1987 16:58:33 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.82, 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 3 4957 4957
Preci PG 8 724 5681
Castelsantangelo sul Nera MC 9 281 5962
Visso MC 12 1107 7069
Cascia PG 14 3217 10286
Ussita MC 14 444 10730
Cerreto di Spoleto PG 15 1075 11805
Sellano PG 16 1079 12884
Arquata del Tronto AP 17 1178 14062
Poggiodomo PG 18 117 14179
Accumoli RI 18 667 14846
Montegallo AP 19 523 15369

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km E of Foligno (57155 inhabitants)
47 Km NE of Terni (111501 inhabitants)
53 Km W of Teramo (54892 inhabitants)
58 Km NW of L'Aquila (69753 inhabitants)
66 Km E of Perugia (166134 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
93 Km E of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
99 Km N of Tivoli (56533 inhabitants)
99 Km W of Pescara (121014 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 2.2 1987-09-28
15:58:33
42.82 13.1 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 56169
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-09-28 15:58:33 ± 0.15
Latitude 42.82 ± 0.01
Longitude 13.10 ± 0.01
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 56169

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) 1439.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 134
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00308
Epicentral distance of station farthest from the epicenter (degree) 0.00615
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:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 56169
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:53:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-09-28T15:58:57.00 10.0 undecidable manual SG 350 0.0062 -0.64 0.1
--.MNS.Z. 1987-09-28T15:58:52.50 10.0 undecidable manual SG 215 0.0048 -0.32 0.4
--.CM8.Z. 1987-09-28T15:58:48.50 10.0 undecidable manual SG 4 0.0033 0.44 0.4
--.ARV.Z. 1987-09-28T15:58:47.00 10.0 undecidable manual PG 350 0.0062 -0.52 0.4
--.ALP.Z. 1987-09-28T15:58:46.37 10.0 undecidable manual SG 97 0.0031 -0.27 0.7
--.MNS.Z. 1987-09-28T15:58:45.00 10.0 undecidable manual PG 215 0.0048 0.26 1.2
--.PRG.Z. 1987-09-28T15:58:42.00 10.0 undecidable manual PG! 298 0.0053 -3.68 0
--.CM8.Z. 1987-09-28T15:58:41.98 10.0 undecidable manual PG 4 0.0033 0.25 2.5
--.ALP.Z. 1987-09-28T15:58:41.20 10.0 undecidable manual PG 97 0.0031 0.03 3.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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