Earthquake with magnitude of Md 2.3 on date 29-11-1987 and time 09:21:48 (UTC) in region 8 km W Arquata del Tronto (AP)

A magnitude Md 2.3 earthquake occured in region: 8 km W Arquata del Tronto (AP), on

  • 29-11-1987 09:21:48 (UTC)
  • 29-11-1987 10:21:48 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8, 13.21 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
Arquata del Tronto AP 8 1178 1178
Norcia PG 10 4957 6135
Montegallo AP 11 523 6658
Accumoli RI 12 667 7325
Castelsantangelo sul Nera MC 12 281 7606
Montemonaco AP 15 604 8210
Acquasanta Terme AP 17 2916 11126
Preci PG 17 724 11850
Ussita MC 17 444 12294
Visso MC 18 1107 13401
Cascia PG 18 3217 16618
Montefortino FM 19 1178 17796
Amatrice RI 20 2657 20453

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km W of Teramo (54892 inhabitants)
45 Km E of Foligno (57155 inhabitants)
52 Km NW of L'Aquila (69753 inhabitants)
53 Km NE of Terni (111501 inhabitants)
75 Km E of Perugia (166134 inhabitants)
83 Km W of Montesilvano (53738 inhabitants)
90 Km W of Pescara (121014 inhabitants)
93 Km NW of Chieti (51815 inhabitants)
95 Km S of Ancona (100861 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
99 Km NE of Tivoli (56533 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
Rev 1000 Md 2.3
ML-VAX 1.6
1987-11-29
09:21:48
42.8 13.21 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 59019
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-11-29 09:21:48 ± 0.064
Latitude 42.80 ± 0.00
Longitude 13.21 ± 0.01
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 59019

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) 576.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 100
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00235
Epicentral distance of station farthest from the epicenter (degree) 0.00648
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 3
Type of magnitude Md
Reference to an origin 59019
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:56:25

ML:1.6

Field Value
Value 1.6
Uncertainty
Num. used stations 2
Type of magnitude ML
Reference to an origin 59019
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. 1987-11-29T09:22:14.40 10.0 undecidable manual SG 344 0.0065 -0.21 0.2
--.MNS.Z. 1987-11-29T09:22:09.64 10.0 undecidable manual SG 223 0.0051 0.49 0
--.ASS.Z. 1987-11-29T09:22:06.69 10.0 undecidable manual SG 303 0.0044 0.14 0.4
--.AQU.Z. 1987-11-29T09:22:05.59 10.0 undecidable manual SG 162 0.0041 -0.24 0.2
--.CM8.Z. 1987-11-29T09:22:03.64 10.0 undecidable manual SG 353 0.0036 0.11 0.7
--.ARV.Z. 1987-11-29T09:22:02.91 10.0 undecidable manual PG 344 0.0065 -0.26 0.3
--.MNS.Z. 1987-11-29T09:22:00.15 10.0 undecidable manual PG 223 0.0051 -0.08 1.2
--.ASS.Z. 1987-11-29T09:21:58.71 10.0 undecidable manual PG 303 0.0044 -0.01 1.5
--.AQU.Z. 1987-11-29T09:21:58.20 10.0 undecidable manual PG 162 0.0041 -0.11 1.2
--.ALP.Z. 1987-11-29T09:21:58.27 10.0 undecidable manual SG 93 0.0023 0.04 0.9
--.CM8.Z. 1987-11-29T09:21:57.40 10.0 undecidable manual PG 353 0.0036 0.06 2.8
--.ALP.Z. 1987-11-29T09:21:54.10 10.0 negative manual PG 93 0.0023 0.09 2.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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