Earthquake with magnitude of Md 2.4 on date 18-11-1987 and time 03:42:26 (UTC) in region 4 km NW Accumoli (RI)

A magnitude Md 2.4 earthquake occured in region: 4 km NW Accumoli (RI), on

  • 18-11-1987 03:42:26 (UTC)
  • 18-11-1987 04:42:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.73, 13.23 at 5 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
Accumoli RI 4 667 667
Arquata del Tronto AP 8 1178 1845
Amatrice RI 12 2657 4502
Cittareale RI 13 482 4984
Norcia PG 13 4957 9941
Acquasanta Terme AP 16 2916 12857
Montegallo AP 16 523 13380
Cascia PG 18 3217 16597
Castelsantangelo sul Nera MC 20 281 16878

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km W of Teramo (54892 inhabitants)
44 Km NW of L'Aquila (69753 inhabitants)
50 Km SE of Foligno (57155 inhabitants)
51 Km E of Terni (111501 inhabitants)
79 Km W of Montesilvano (53738 inhabitants)
81 Km SE of Perugia (166134 inhabitants)
86 Km W of Pescara (121014 inhabitants)
88 Km W of Chieti (51815 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km NE of Tivoli (56533 inhabitants)
98 Km E of Viterbo (67173 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 2.4
ML-VAX 1.7
1987-11-18
03:42:26
42.73 13.23 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 58649
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-11-18 03:42:26 ± 0.188
Latitude 42.73 ± 0.01
Longitude 13.23 ± 0.02
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 58649

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) 1738.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 79
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00227
Epicentral distance of station farthest from the epicenter (degree) 0.00988
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 58649
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:56:07

ML:1.7

Field Value
Value 1.7
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 58649
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
--.CP9.Z. 1987-11-18T03:42:59.23 10.0 undecidable manual SG 193 0.0079 1.24 0.2
--.AM8.Z. 1987-11-18T03:42:59.12 10.0 undecidable manual SG 18 0.0078 1.84 0
--.ARV.Z. 1987-11-18T03:42:55.95 10.0 undecidable manual SG 345 0.0071 0.79 0.4
--.AZ9.Z. 1987-11-18T03:42:53.80 10.0 undecidable manual SG 168 0.0067 0.14 0.7
--.SDI.Z. 1987-11-18T03:42:48.40 10.0 undecidable manual PN 157 0.0099 -0.57 1
--.ASS.Z. 1987-11-18T03:42:46.84 10.0 undecidable manual SG 308 0.0048 0.03 0.7
--.MNS.Z. 1987-11-18T03:42:46.72 10.0 undecidable manual SG 230 0.0047 0.26 0.7
--.CP9.Z. 1987-11-18T03:42:45.98 10.0 undecidable manual PG 193 0.0079 1.25 0.4
--.AM8.Z. 1987-11-18T03:42:44.36 10.0 undecidable manual PG 18 0.0078 0.04 1.6
--.ARV.Z. 1987-11-18T03:42:42.70 10.0 undecidable manual PG 345 0.0071 -1.03 0.6
--.AZ9.Z. 1987-11-18T03:42:42.00 10.0 undecidable manual PG 168 0.0067 -0.23 1.6
--.AQU.Z. 1987-11-18T03:42:41.20 10.0 undecidable manual SG 161 0.0035 -0.67 0.5
--.MNS.Z. 1987-11-18T03:42:37.65 10.0 undecidable manual PG 230 0.0047 -0.42 1.6
--.ASS.Z. 1987-11-18T03:42:37.71 10.0 undecidable manual PG 308 0.0048 -0.56 1.4
--.CM8.Z. 1987-11-18T03:42:36.35 10.0 undecidable manual PG 352 0.0042 -0.68 1.2
--.ALP.Z. 1987-11-18T03:42:36.62 10.0 undecidable manual SG 77 0.0023 0.06 1.1
--.AQU.Z. 1987-11-18T03:42:34.50 10.0 undecidable manual PG 161 0.0035 -0.93 0.8
--.ALP.Z. 1987-11-18T03:42:32.27 10.0 positive manual PG 77 0.0023 -0.09 3.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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