Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.3 on date 04-01-1989 and time 12:57:17 (Italy) in region 7 km SE Arquata del Tronto (AP)

A magnitude Md 2.3 earthquake occured in region: 7 km SE Arquata del Tronto (AP), on

  • 04-01-1989 11:57:17 (UTC)
  • 04-01-1989 12:57:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7200, 13.3360 at 9 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.

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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 7 1178 1178
Accumoli RI 8 667 1845
Acquasanta Terme AP 8 2916 4761
Amatrice RI 11 2657 7418
Valle Castellana TE 13 977 8395
Montegallo AP 14 523 8918
Rocca Santa Maria TE 16 537 9455
Cortino TE 18 656 10111
Cittareale RI 18 482 10593
Campotosto AQ 18 542 11135
Roccafluvione AP 20 2010 13145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km W of Teramo (54892 inhabitants)
41 Km N of L'Aquila (69753 inhabitants)
58 Km E of Foligno (57155 inhabitants)
59 Km E of Terni (111501 inhabitants)
70 Km W of Montesilvano (53738 inhabitants)
77 Km W of Pescara (121014 inhabitants)
80 Km NW of Chieti (51815 inhabitants)
88 Km E of Perugia (166134 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
95 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
Bulletin
Rev1000 		Md 2.3
ML-VAX 1.7 		1989-01-04
11:57:17		 42.72 13.336 9 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 84669
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1989-01-04 11:57:17 ± 0.252
Latitude 42.7200 ± 0.0121
Longitude 13.3360 ± 0.0261
Depth (km) 9 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 84669

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) 2521.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 90
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00162
Epicentral distance of station farthest from the epicenter (degree) 0.00955
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 84669
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:19:28

ML:1.7

Field Value
Value 1.7
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 84669
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(km) Takeoff_angle Residual Weight
--.ARV.Z. 1989-01-04T11:57:47.40 10.0 undecidable manual SG 340 0.8214 0.73 0.2
--.AM8.Z. 1989-01-04T11:57:47.90 10.0 undecidable manual SG 13 0.8436 0.54 0.4
--.MNS.Z. 1989-01-04T11:57:39.32 10.0 undecidable manual SG 235 0.5883 0.43 0.4
--.ASS.Z. 1989-01-04T11:57:39.75 10.0 undecidable manual SG 304 0.5994 0.24 0.4
--.SDI.Z. 1989-01-04T11:57:38.83 10.0 undecidable manual PN 160 1.0656 0.01 0.9
--.ARV.Z. 1989-01-04T11:57:36.20 10.0 undecidable manual PG 340 0.8214 1.68 0
--.CM8.Z. 1989-01-04T11:57:35.40 10.0 undecidable manual SG 343 0.4995 -0.54 0.5
--.AM8.Z. 1989-01-04T11:57:34.30 10.0 undecidable manual PG 13 0.8436 -0.61 0.5
--.ASS.Z. 1989-01-04T11:57:30.28 10.0 negative manual PG 304 0.5994 -0.1 2.3
--.MNS.Z. 1989-01-04T11:57:29.92 10.0 negative manual PG 235 0.5883 -0.1 2.4
--.SS8.Z. 1989-01-04T11:57:29.60 10.0 undecidable manual SG 345 0.2997 0.01 0.7
--.CM8.Z. 1989-01-04T11:57:27.60 10.0 undecidable manual PG 343 0.4995 -0.72 1
--.ALP.Z. 1989-01-04T11:57:25.30 10.0 undecidable manual SG 70 0.1776 -0.2 0.7
--.SS8.Z. 1989-01-04T11:57:24.60 10.0 undecidable manual PG 345 0.2997 -0.05 2.4
--.ALP.Z. 1989-01-04T11:57:22.50 10.0 undecidable manual PG 70 0.1776 0.2 2.3
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download