Earthquake with magnitude of Md 2.3 on date 22-08-1987 and time 02:34:43 (Italy) in region 3 km N Poggiodomo (PG)

A magnitude Md 2.3 earthquake occured in region: 3 km N Poggiodomo (PG), on

  • 22-08-1987 00:34:43 (UTC)
  • 22-08-1987 02:34:43 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.743, 12.939 at 3 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
Poggiodomo PG 3 117 117
Cascia PG 7 3217 3334
Vallo di Nera PG 7 364 3698
Sant'Anatolia di Narco PG 8 564 4262
Cerreto di Spoleto PG 9 1075 5337
Scheggino PG 9 461 5798
Monteleone di Spoleto PG 10 599 6397
Norcia PG 14 4957 11354
Campello sul Clitunno PG 16 2442 13796
Spoleto PG 16 38218 52014
Sellano PG 16 1079 53093
Preci PG 17 724 53817
Ferentillo TR 18 1913 55730
Polino TR 19 233 55963

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SE of Foligno (57155 inhabitants)
31 Km NE of Terni (111501 inhabitants)
58 Km NW of L'Aquila (69753 inhabitants)
60 Km SE of Perugia (166134 inhabitants)
63 Km W of Teramo (54892 inhabitants)
77 Km E of Viterbo (67173 inhabitants)
84 Km N of Guidonia Montecelio (88673 inhabitants)
87 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 2.3
ML-VAX 1.8
1987-08-22
00:34:43
42.743 12.939 3 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 54289
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-08-22 00:34:43 ± 0.114
Latitude 42.7430 ± 0.0052
Longitude 12.9390 ± 0.0121
Depth (km) 3 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 54289

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) 1149.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 118
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
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) 0.0034
Epicentral distance of station farthest from the epicenter (degree) 0.01093
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 54289
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:52:20

ML:1.8

Field Value
Value 1.8
Uncertainty
Num. used stations 2
Type of magnitude ML
Reference to an origin 54289
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-08-22T00:35:10.35 10.0 undecidable manual SG 0 0.0067 -0.33 0.3
--.SDI.Z. 1987-08-22T00:35:07.48 10.0 undecidable manual PN 147 0.0109 0.4 0.5
--.CM8.Z. 1987-08-22T00:35:01.79 10.0 undecidable manual SG 18 0.0042 0.2 0.9
--.ALP.Z. 1987-08-22T00:35:01.40 10.0 undecidable manual SG! 85 0.0041 -0.05 0
--.ASS.Z. 1987-08-22T00:34:58.22 10.0 undecidable manual SG 326 0.0034 0.24 0.5
--.MNS.Z. 1987-08-22T00:34:58.35 10.0 undecidable manual SG 207 0.0036 -0.55 0.1
--.ARV.Z. 1987-08-22T00:34:58.74 10.0 undecidable manual PG 0 0.0067 -0.34 0.8
--.ALP.Z. 1987-08-22T00:34:53.62 10.0 undecidable manual PG? 85 0.0041 0.07 0.7
--.CM8.Z. 1987-08-22T00:34:53.65 10.0 undecidable manual PG 18 0.0042 -0.18 3.2
--.ASS.Z. 1987-08-22T00:34:52.80 10.0 undecidable manual PG 326 0.0034 0.33 1
--.MNS.Z. 1987-08-22T00:34:52.27 10.0 undecidable manual PG 207 0.0036 -0.01 1.9
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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