Earthquake with magnitude of Md 2.2 on date 16-11-1987 and time 05:58:31 (UTC) in region N Preci (PG)

A magnitude Md 2.2 earthquake occured in region: N Preci (PG), on

  • 16-11-1987 05:58:31 (UTC)
  • 16-11-1987 06:58:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.88, 13.04 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
Preci PG 1 724 724
Visso MC 7 1107 1831
Sellano PG 9 1079 2910
Castelsantangelo sul Nera MC 9 281 3191
Ussita MC 11 444 3635
Norcia PG 11 4957 8592
Cerreto di Spoleto PG 12 1075 9667
Monte Cavallo MC 13 145 9812
Fiordimonte MC 18 202 10014
Pieve Torina MC 18 1458 11472
Cascia PG 18 3217 14689
Vallo di Nera PG 19 364 15053
Fiastra MC 20 559 15612
Bolognola MC 20 142 15754
Acquacanina MC 20 121 15875

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
59 Km E of Perugia (166134 inhabitants)
60 Km W of Teramo (54892 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
90 Km SW of Ancona (100861 inhabitants)
92 Km NE of Viterbo (67173 inhabitants)
100 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
Rev 1000 Md 2.2 1987-11-16
05:58:31
42.88 13.04 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 58589
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-11-16 05:58:31 ± 0.19
Latitude 42.88 ± 0.01
Longitude 13.04 ± 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 58589

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) 1645.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 145
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00283
Epicentral distance of station farthest from the epicenter (degree) 0.0055
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:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 58589
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:56:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-11-16T05:58:53.85 10.0 undecidable manual SG 353 0.0055 0.45 0.3
--.MNS.Z. 1987-11-16T05:58:51.30 10.0 undecidable manual SG 208 0.005 -0.66 0.1
--.ALP.Z. 1987-11-16T05:58:46.52 10.0 undecidable manual SG 104 0.0036 0.13 0.9
--.CM8.Z. 1987-11-16T05:58:44.40 10.0 undecidable manual SG 13 0.0028 0.23 0.8
--.ARV.Z. 1987-11-16T05:58:43.85 10.0 undecidable manual PG 353 0.0055 -0.35 0.9
--.MNS.Z. 1987-11-16T05:58:43.58 10.0 undecidable manual PG 208 0.005 0.37 0.9
--.ALP.Z. 1987-11-16T05:58:39.93 10.0 undecidable manual PG 104 0.0036 -0.22 2.7
--.CM8.Z. 1987-11-16T05:58:38.15 10.0 undecidable manual PG 13 0.0028 -0.51 1.3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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