Earthquake Tirreno Meridionale (MARE), Magnitude mb 4.9, 19 July 1985 time 02:25:48 (Timezone Italy)

A magnitude mb 4.9 earthquake occured in region: Tirreno Meridionale (MARE), on

19-07-1985 00:25:48 (UTC)
19-07-1985 02:25:48 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 39.7960, 13.7610 at 611 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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Display location by

Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 inhabitants.

Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.

Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.

Shakemap

Not available maps for this sismic event.

Felt maps

Not available maps for this sismic event.

Locations history

Type	Magnitude	Date and Time (UTC)	Latitude	Longitude	Depth (km)	Published time (UTC)	Author	Location ID
Bulletin Rev1000	mb 4.9	1985-07-19 00:25:48	39.796	13.761	611	2013-07-15 08:40:51	Bollettino Sismico Italiano INGV	10269

Preferred location and magnitude until now.

Origin information

Origin

Field	Value
Time (UTC)	1985-07-19 00:25:48 ± 1.168
Latitude	39.7960 ± 0.0267
Longitude	13.7610 ± 0.0415
Depth (km)	611 ± 10 (from location)
Evaluation mode of Origin	manual
Evaluation status of Origin	reviewed
Version	1000 -> BULLETIN-VAX
Event type	earthquake
Origin ID	10269

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)	4621.2
Confidence level of the uncertainty (%)	68

Quality

Field	Value
Largest azimuthal gap in station distribution as seen from epicenter (degree)	110
Number of associated phases, regardless of their use for origin computation	48
Number of defining phases	48
RMS of the travel time residuals of the arrivals used for the origin computation (sec)	0.4
Epicentral distance of station closest to the epicenter (degree)	0.00809
Epicentral distance of station farthest from the epicenter (degree)	0.05974
Number of stations at which the event was observed	48
Number of stations from which data was used for origin computation	48

Magnitude information

mb:4.9

Field	Value
Value	4.9
Uncertainty
Num. used stations
Type of magnitude	mb
Reference to an origin	10269
Agency	INGV
Autore	ISC
Time of creation (UTC)	2013-01-09 08:10:34

Picking and Arrival

SCNL	Time	Uncertainty	Polarity	Evaluation_mode	Phase	Azimuth	Distance	Residual	Weight
--.RBL.Z.	1985-07-19T00:27:49.00	10.0	undecidable	manual	P	359	0.0597	-0.01	0.6
--.SAL.Z.	1985-07-19T00:27:45.50	10.0	undecidable	manual	P	339	0.0564	0.32	0.5
--.CTI.Z.	1985-07-19T00:27:45.50	10.0	negative	manual	P	347	0.0579	-1.35	0.1
--.CK1.Z.	1985-07-19T00:27:44.70	10.0	undecidable	manual	P	320	0.0554	0.76	0.2
--.ROB.Z.	1985-07-19T00:27:44.80	10.0	negative	manual	P	318	0.0564	-0.38	1
--.GEN.Z.	1985-07-19T00:27:40.80	10.0	negative	manual	P	324	0.0525	0.02	1.3
--.BVT.Z.	1985-07-19T00:27:38.20	10.0	undecidable	manual	P	329	0.0496	0.75	0.3
--.BD1.Z.	1985-07-19T00:27:31.00	10.0	negative	manual	P	332	0.0438	-0.29	1.3
--.PS9.Z.	1985-07-19T00:27:29.40	10.0	negative	manual	P	329	0.0414	0.48	1
--.FIR.Z.	1985-07-19T00:27:27.00	10.0	negative	manual	P	336	0.0395	-0.05	1.6
--.CH1.Z.	1985-07-19T00:27:24.00	10.0	undecidable	manual	P	341	0.0365	-0.27	0.8
--.AR1.Z.	1985-07-19T00:27:21.80	10.0	negative	manual	P	351	0.0338	0.07	1.7
--.AM1.Z.	1985-07-19T00:27:20.90	10.0	negative	manual	P	358	0.0338	-0.86	0.6
--.CM2.Z.	1985-07-19T00:27:19.10	10.0	negative	manual	P	352	0.0308	-0.18	1.8
--.AS1.Z.	1985-07-19T00:27:19.00	10.0	undecidable	manual	P	346	0.0303	0.13	0.9
--.LCI.Z.	1985-07-19T00:27:19.50	10.0	negative	manual	P	79	0.0303	0.62	0.9
--.PT9.Z.	1985-07-19T00:27:19.00	10.0	undecidable	manual	P	205	0.0296	0.68	0.4
--.MA1.Z.	1985-07-19T00:27:18.50	10.0	negative	manual	P	324	0.0295	0.31	1.5
--.PO9.Z.	1985-07-19T00:27:16.00	10.0	negative	manual	P	348	0.0256	0.73	0.7
--.ALP.Z.	1985-07-19T00:27:16.30	10.0	negative	manual	P	357	0.0269	0.08	1.9
--.PE1.Z.	1985-07-19T00:27:16.30	10.0	undecidable	manual	P	69	0.0266	0.24	0.8
--.BRT.Z.	1985-07-19T00:27:15.00	10.0	negative	manual	P	66	0.0251	0.04	1.9
--.PA1.Z.	1985-07-19T00:27:15.50	10.0	undecidable	manual	P	161	0.0261	-0.17	0.9
--.FA1.Z.	1985-07-19T00:27:14.00	10.0	negative	manual	P	181	0.0227	0.68	0.9
--.MNS.Z.	1985-07-19T00:27:14.50	10.0	negative	manual	P	343	0.0244	0.06	1.9
--.AQU.Z.	1985-07-19T00:27:14.00	10.0	negative	manual	P	354	0.0231	0.41	1.4
--.BAI.Z.	1985-07-19T00:27:14.50	10.0	negative	manual	P	60	0.0244	0.08	1.9
--.MS1.Z.	1985-07-19T00:27:12.50	10.0	negative	manual	P	40	0.0227	-0.81	0.8
--.ORI.Z.	1985-07-19T00:27:11.50	10.0	undecidable	manual	P	82	0.0186	0.6	0.5
--.ROI.Z.	1985-07-19T00:27:11.80	10.0	undecidable	manual	P	95	0.0195	0.41	0.7
--.RDP.Z.	1985-07-19T00:27:11.50	10.0	undecidable	manual	P	338	0.0190	0.39	0.7
--.RCI.Z.	1985-07-19T00:27:11.50	10.0	undecidable	manual	P	138	0.0201	-0.22	0.9
--.CSI.Z.	1985-07-19T00:27:11.20	10.0	undecidable	manual	P	89	0.0175	0.91	0.2
--.ACI.Z.	1985-07-19T00:27:10.00	10.0	undecidable	manual	P	102	0.0173	-0.24	0.9
--.DUI.Z.	1985-07-19T00:27:10.50	10.0	negative	manual	P	15	0.0174	0.25	1.7
--.SD1.Z.	1985-07-19T00:27:10.00	10.0	undecidable	manual	P	1	0.0172	-0.15	0.9
--.ERC.Z.	1985-07-19T00:27:10.50	10.0	undecidable	manual	P	208	0.0178	0.03	0.9
--.MMN.Z.	1985-07-19T00:27:10.00	10.0	negative	manual	P	86	0.0154	0.72	0.8
--.DR2.Z.	1985-07-19T00:27:10.20	10.0	negative	manual	P	124	0.0183	-0.53	1.3
--.MSI.Z.	1985-07-19T00:27:09.50	10.0	undecidable	manual	P	138	0.0190	-1.62	0
--.TR9.Z.	1985-07-19T00:27:09.50	10.0	negative	manual	P	41	0.0151	0.37	1.5
--.SGG.Z.	1985-07-19T00:27:08.90	10.0	negative	manual	P	16	0.0149	-0.15	1.9
--.GIB.Z.	1985-07-19T00:27:08.50	10.0	undecidable	manual	P	173	0.0164	-1.22	0.2
--.SGO.Z.	1985-07-19T00:27:08.00	10.0	undecidable	manual	P	56	0.0126	-0.11	0.9
--.OVO.Z.	1985-07-19T00:27:07.00	10.0	negative	manual	P	25	0.0102	-0.27	1.8
--.MSC.Z.	1985-07-19T00:27:07.50	10.0	negative	manual	P	6	0.0126	-0.61	1.2
--.QR9.Z.	1985-07-19T00:27:07.00	10.0	undecidable	manual	P	15	0.0100	-0.22	0.9
--.SOR.Z.	1985-07-19T00:27:05.70	10.0	negative	manual	P	29	0.0081	-0.96	0.5

TDMT - Time Domain Moment Tensor

Not available TDMT solution for this seismic event.

Fault Plane solutions in the area

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.

Download

Type	Description	Link
QuakeML - small	Event, Origin, FocalMechanism	Download
QuakeML - full	Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude	Download

Earthquake with magnitude of mb 4.9 on date 19-07-1985 and time 02:25:48 (Italy) in region Tirreno Meridionale (MARE)