Earthquake with magnitude of Md 2.8 on date 07-08-1987 and time 05:10:04 (Italy) in region 6 km W Arquata del Tronto (AP)

A magnitude Md 2.8 earthquake occured in region: 6 km W Arquata del Tronto (AP), on

  • 07-08-1987 03:10:04 (UTC)
  • 07-08-1987 05:10:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.77, 13.224 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
Arquata del Tronto AP 6 1178 1178
Accumoli RI 9 667 1845
Norcia PG 11 4957 6802
Montegallo AP 12 523 7325
Castelsantangelo sul Nera MC 15 281 7606
Acquasanta Terme AP 15 2916 10522
Amatrice RI 16 2657 13179
Montemonaco AP 17 604 13783
Cittareale RI 18 482 14265
Cascia PG 18 3217 17482
Preci PG 19 724 18206

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km W of Teramo (54892 inhabitants)
47 Km E of Foligno (57155 inhabitants)
49 Km NW of L'Aquila (69753 inhabitants)
53 Km E of Terni (111501 inhabitants)
78 Km E of Perugia (166134 inhabitants)
81 Km W of Montesilvano (53738 inhabitants)
88 Km W of Pescara (121014 inhabitants)
90 Km NW of Chieti (51815 inhabitants)
95 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km NE of Tivoli (56533 inhabitants)
97 Km S of Ancona (100861 inhabitants)
100 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
Bulletin
Rev1000
Md 2.8
ML-VAX 2.5
1987-08-07
03:10:04
42.77 13.224 3 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 53479
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-08-07 03:10:04 ± 0.218
Latitude 42.7700 ± 0.0083
Longitude 13.2240 ± 0.0165
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 53479

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) 1629.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 78
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
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) 0.03869
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitudes information

Md:2.8

Field Value
Value 2.8
Uncertainty
Num. used stations 6
Type of magnitude Md
Reference to an origin 53479
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:51:35

ML:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 5
Type of magnitude ML
Reference to an origin 53479
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
--.CTI.Z. 1987-08-07T03:11:39.20 10.0 undecidable manual SN 341 0.0312 0.29 0.3
--.KBA.Z. 1987-08-07T03:11:11.00 10.0 undecidable manual PN 1 0.0387 0.52 0.6
--.FOI.Z. 1987-08-07T03:11:04.83 10.0 undecidable manual PN 355 0.0345 0.83 0.4
--.CTI.Z. 1987-08-07T03:10:59.53 10.0 undecidable manual PN 341 0.0312 0.63 0.6
--.SDI.Z. 1987-08-07T03:10:43.27 10.0 undecidable manual SN 157 0.0103 -0.54 0.5
--.RMP.Z. 1987-08-07T03:10:39.20 10.0 undecidable manual SG 202 0.0092 -1.58 0
--.AM8.Z. 1987-08-07T03:10:34.25 10.0 undecidable manual SG 19 0.0074 0.3 1
--.ARV.Z. 1987-08-07T03:10:31.46 10.0 undecidable manual SG 344 0.0068 -0.28 0.6
--.CRE.Z. 1987-08-07T03:10:29.84 10.0 undecidable manual PN 313 0.0113 1.22 0.3
--.PRO.Z. 1987-08-07T03:10:27.90 10.0 undecidable manual PN 348 0.0105 0.41 1.4
--.RMP.Z. 1987-08-07T03:10:26.40 10.0 undecidable manual PG 202 0.0092 0.81 0.8
--.SDI.Z. 1987-08-07T03:10:26.32 10.0 undecidable manual PN 157 0.0103 -0.76 0.9
--.MC8.Z. 1987-08-07T03:10:24.91 10.0 undecidable manual SG 15 0.0049 0.05 1
--.ASS.Z. 1987-08-07T03:10:23.33 10.0 undecidable manual SG 305 0.0045 -0.5 0.5
--.MNS.Z. 1987-08-07T03:10:23.72 10.0 undecidable manual SG 226 0.0049 -1.54 0
--.AM8.Z. 1987-08-07T03:10:20.68 10.0 negative manual PG 19 0.0074 -0.71 2
--.AQU.Z. 1987-08-07T03:10:20.82 10.0 undecidable manual SG 162 0.0039 -0.24 0.7
--.ARV.Z. 1987-08-07T03:10:19.62 10.0 undecidable manual PG 344 0.0068 -0.49 1.3
--.CM8.Z. 1987-08-07T03:10:19.80 10.0 undecidable manual SG 352 0.0038 -0.98 0.4
--.MNS.Z. 1987-08-07T03:10:16.80 10.0 undecidable manual PG 226 0.0049 0.43 1.4
--.MC8.Z. 1987-08-07T03:10:15.20 10.0 undecidable manual PG 15 0.0049 -1.12 0.4
--.ASS.Z. 1987-08-07T03:10:15.76 10.0 undecidable manual PG 305 0.0045 0.21 1.7
--.AQU.Z. 1987-08-07T03:10:14.40 10.0 undecidable manual PG 162 0.0039 0.09 1.7
--.ALP.Z. 1987-08-07T03:10:13.72 10.0 undecidable manual SG 87 0.0023 -0.28 1
--.CM8.Z. 1987-08-07T03:10:13.72 10.0 negative manual PG 352 0.0038 -0.07 3.5
--.ALP.Z. 1987-08-07T03:10:10.30 10.0 negative manual PG 87 0.0023 0.43 2.9
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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