Earthquake with magnitude of Md 2.1 on date 09-11-1987 and time 19:18:23 (UTC) in region 3 km SE Accumoli (RI)

A magnitude Md 2.1 earthquake occured in region: 3 km SE Accumoli (RI), on

  • 09-11-1987 19:18:23 (UTC)
  • 09-11-1987 20:18:23 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.68, 13.28 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
Accumoli RI 3 667 667
Amatrice RI 5 2657 3324
Arquata del Tronto AP 11 1178 4502
Cittareale RI 12 482 4984
Acquasanta Terme AP 15 2916 7900
Campotosto AQ 15 542 8442
Montereale AQ 17 2581 11023
Capitignano AQ 17 665 11688
Montegallo AP 19 523 12211
Valle Castellana TE 19 977 13188
Cortino TE 20 656 13844
Norcia PG 20 4957 18801

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km W of Teramo (54892 inhabitants)
38 Km N of L'Aquila (69753 inhabitants)
53 Km E of Terni (111501 inhabitants)
56 Km SE of Foligno (57155 inhabitants)
74 Km W of Montesilvano (53738 inhabitants)
80 Km W of Pescara (121014 inhabitants)
81 Km W of Chieti (51815 inhabitants)
87 Km SE of Perugia (166134 inhabitants)
88 Km NE of Guidonia Montecelio (88673 inhabitants)
89 Km NE 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
Rev 1000 Md 2.1 1987-11-09
19:18:23
42.68 13.28 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 58409
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-11-09 19:18:23 ± 0.398
Latitude 42.68 ± 0.02
Longitude 13.28 ± 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 58409

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) 3148.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 172
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
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) 0.0021
Epicentral distance of station farthest from the epicenter (degree) 0.00469
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 58409
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:55:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1987-11-09T19:18:43.36 10.0 undecidable manual SG 236 0.0047 1.2 0
--.CM8.Z. 1987-11-09T19:18:42.11 10.0 undecidable manual SG 349 0.0047 -0.01 0.8
--.CM8.Z. 1987-11-09T19:18:34.19 10.0 undecidable manual PG 349 0.0047 0.02 1.3
--.MNS.Z. 1987-11-09T19:18:33.60 10.0 undecidable manual PG 236 0.0047 -0.59 0.5
--.ALP.Z. 1987-11-09T19:18:33.13 10.0 undecidable manual SG 64 0.0021 0.35 0.6
--.ALP.Z. 1987-11-09T19:18:28.70 10.0 undecidable manual PG 64 0.0021 -0.07 2.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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